Our evacuated tube system had a Thermo Technologies USDT 3002 "pump station" with pump and controls. It monitored water tank temps and operated at pre-programed temperatures - so as to not cool the hot water tank when there was no sun. It worked perfectly for years, with no noise and zero maintenance. I did monitor the pressure gauge on the pump station (to see if the system had a leak) and there was a glass sight tube to monitor the color of the antifreeze (food grade). If the color of the antifreeze changes, it was over-heated.
Amazing system,thanks for the share? It has sparked my interest in this technology… This is the first evacuated tube system I’ve been exposed too… very cool!!!!
Hi Dave. I'm from the midwest where there many cloudy days throughout the year. I'd also like to help people in my region take better advantage of sustainable energy rather than fossil fuels. Could you please further explain how these systems can boil water without direct sunlight? Be as specific and detailed as you like. We can't afford another century of wasted energy.
@Will Swift For hot air? A brick heat chest baffled so the flows up and down as the air travels along the length would help. If you are not using the exhaust from a woodstove that is...
That pump is SO noisy I suspect it is spinning in air. That is, you may have air in the system which allows the pump to overspeed. My system used to do this until I installed a purge pump just to remove that air. I also installed a flow gauge so I can actually see the glycol, judge its condition by its colour and measure its flow in liters per minute. If air does cause problems you'll see that because the flow drops to zero.
Those are good recommendations. It is kind of a crap shoot knowing what's going on in the pipe without a flow gauge. I just had to pump until fluid came out the valve that's above the whole pipe run. You'd think that if you ran it with that valve open the air would all settle out of the system. But it could be that is part of the problem. Thanks!
Even a small branch will cut the power down on your pv panel and slow down or stop the pump panel should be in full sun. Solar hot water tubes will boil the antifreeze /glycol/ and gum things up ,gets way to hot when the pump is not circulating properly. Should be tested and changed out with the proper glycol water mix, the tubes are ok with a little shade, tubes are so well insulated snow and ice won't melt off for a long time so having them where you can clean them off easily is a good thing.
Thanks for the info! Yes that's why I had the tubes covered when the pump wasn't working. Didn't want to heat the fluid without circulation. I wasn't sure if the black gunk in the pump was residue from overheated antifreeze, or from bits of the plastic part of the pump flaking off from friction. Clearly the pump was not running smoothly and so might have been causing friction. Yes, a solar panel will get almost no power with the slightest shade on it. Good to know about cleaning snow off them. Makes sense that they wouldn't heat up, being that they have a vacuum inside. We have to clean off our PVs all the time in winter. I still think it would be possible to clean them with a brush on a pole like we do with PVs.
The tubes can be mounted almost vertical with a slight angle for the winter sun for the snow, personally on a roof I like a flat hot water panels, snow melts off easily, the tubes will stay frosted up pretty hard to clean off, then the tubes are pretty fragile, when reaching up with a pole. Is this system just heating up a water tank for hot water? Pump should always be running when the sun is out , that extra heat should be dumped into a space where it can be stored, basement, crawl space, concrete slab or even a tank of water with a heat exchanger or just a roll of flexible pipe in the tank, heats up and stores heat for later. Personally I would install another pump and panel in the system, that system is pretty big, it will heat a lot of fluid going through it, then it's a backup so the system doesn't over heat. Pump cost little compared to the system.
@@ronaldsahn9649 This system heats water in a hot water heater tank and there is also a wood stove for supplemental heat in the winter, so the cook stove in the kitchen can be used to heat water as well. Then the system is also connected to radiant floor tubing for heating the house, so the panels and the wood stove heat water for heating the rest of the house with radiant floor tubing. I'm not sure if during the summer it can put too much heat into the system since it's only needed for heating water for kitchen and bath use at that time of year. I would guess it doesn't have a lot of waste or it wouldn't be set to just run all the time the sun is shining. Maybe if there was an easy way to cover the panels during a snow storm it would be easier to keep them clean.
That's a good system with the heat storage, as large as the system is shouldn't have any problems heating and storing the heat in the floors, looks like the week link is just the volume of the pumping, 2 pumps 2 pv panels would push a lot more heat into the storage and be a good backup and simple. Summer time the system still needs to run and need to dump that heat somewhere else probably be covered with shade cloth during the summer, as long as you have enough hot water. Dumping the heat is a separate problem, but could be used to extend the growing season in greenhouse grow beds, spring and fall when heat is not needed in the house. I've done a lot of work finding leaks in snow melt and in floor heating systems with a thermal camera, if the system is hot you can see all the lines and you will see a leak or a pinched line pretty easy now cameras are pretty cheap to rent seen them at home Depot or borrow from a plumber. I think I paid 700 bucks for the one I got last year, 15 years ago they were 25 grand.
@@ronaldsahn9649 we have that hot water heating system, but we don't have anyone to help us connect, could you help us in any way, if you have any instructions to forward to me?
That particular type of pump had no bearing. The impeller is floating in the fluid as a bearing. The sound you are hearing is most likely from the impeller being out of balance. You could open it again and check each of the channels that leads from the center to the outside of the impeller. Most likely, one is plugged, cutting efficiency, and throwing off the balance.
Thank you! I just don't post often enough. I'm hoping to turn that around. I want to do more live streams and consistent vlog posts. But it takes a lot of time and work. Usually you need to put in 60-70 hrs a week to really build a great channel. I spend a lot of time just trying to grow my own food and do other work for income that it takes away from video production.
Great video; would you be willing to share how much EV tubes cost and which company you got them from; assuming you are happy with the purchase. Thanks. Also, does anyone know if a drain-back system could be used (using water) instead of using glycol with the EV tubes?
I don't know about a drain-back system. What is that? The glycol is used so it doesn't freeze in the tubes and rupture the channels. I can try to find out about the company and cost. They were bought by the person who owns the house...not me.
@@HardcoreSustainable Thank you. A drain back system uses water, not glycol and when the sun goes down drains the water back to the storage tank so the pipes in the collector don't freeze. This system is more effiecient.
It is indeed very difficult to clean a pump. Sometimes i use ( not knowing the English word) a vibrator. 😅 No, not that one. One that i also use to clean carburators. When starting it immendiatly the solvent becomes very dirty. So i need to change that 3 or 4 times before the pump is clean. Last year a friend of mine disconnected his 25/80 Grundfoss pump he has inbetween his wood/central heating system. For almost 6 months. He firstly let his woodstove burn. Then he remebered to put in the pump for power. And his stove was allready boiling. Needless to say the pump did not start because all the sediment clocked up. So stupid. Because i had installed a pumpprotection. So that the pump would automatically start at 30 degrees Celsius. And also every 24 hours would pump for 15 minutes. But he even wanted to save himself that very small amount of money. 😢 Took me 5 hours to get that pump working again. A 400.00 Euro pump. And he even was angry at me because i had installed everything 8 years ago (for free). He has not even one clue how it all operates. And after explaining for almost one hour that if a pump does not turn for several days that sediment can get the pump stuck i stopped explaining. 😢 The story is. Never help friends who have not the slightest understanding how something does work. And also such a wood / central heating system can become dangerous. Especcially when a houseowner so once a while does not check the safety appliances that are build into it. Made a 97 degree Celsius thermal valve that can cool a stainless steel ringtube inside the heat-exchanger. But he had that closed off. 😢 So he had only his 3 bar pressure release-valve. It became very messy and he also was mad at me because of the scare noise it made. After i told him to be happy that he did not blow up his wife and kids i had to go. While he shouted that he would hire a pro. It is better for some ppl to not own such systems. At my house i allways keep some braincells focussed towards how it operates. Also to prevent troubles. Lately i am thinking to add vacuumtubes or solarpanels. To heat the 500 and 6000 liter boiker i have. But still not sure what the best option is. I live at the countryside and solar also would give me some electricity. I then would need to add a electric heatexchanger to the boiler. To warm up the 6000 liter boiler i probably would need a lot of panels. Maybe vacuumtubes would give more rendament ? That is why i am watching some YT video's.
I'm not sure what to recommend for you. The vacuum tubes could bring the temp up and then the water heater could bring it up the rest of the way if it's not hot enough. This system in my video does have a hot water heater tank inside, but I don't know if it does anything but hold the water. It also works with the wood cook stove in winter to heat the water, so there are multiple sources of heat for the water.
If you alternate the current of 12v or 24v systems (the solar panel getting some light, little light, and no light), you will burn even the bests of motors. Sounds like a brushed motor that has overheated. You should back up this motor with a 12v battery and let the solar keep the battery charged while you run this motor.
I do think the motor overheated and part of it melted. I wonder how that battery system would work with the evac tubes though. because if the motor doesn't only turn on when there is sunlight on them and the PV panel powering the motor, you will unheat the water in the water tank by circulating the fluid through the unheated evac tubes. It would definitely have to turn off at night, but in winter it could cool your water very quickly. I see your point, but how would you deal with that situation?
@@HardcoreSustainable .. Thanks for reply ... I always wondered if mirrors or just huge white billboards could without complex fluids bounce enough sunlight into house windows, , , Sure beats our medieval ancestors basically hibernating for 6 months till cld plant crops, poor bastards,,,
What kind of controller are you using? I am using a Tekmar 157 with a variable speed pump and it is getting a lot more usable energy out of my panels than the previous owner did. I'm not sure if there's a 12V equivalent though.
I don't think this system has a controller. The pump goes on when the sun is shining and circulates the coolant liquid. It heats the water in the water heater. When the system is on during the winter, excess heat has to be circulated through the radiant floor tubing in the floor or otherwise dumped somewhere or the pressure valve on the water heater will blow. But this doesn't happen because of the evac tube system, it happens because both the evac tubes and the wood stove are being used to heat the water in the water heater. It's not hard in winter to find ways to deal with excess heat.
@@HardcoreSustainable well it's crude but if it works 🤷♂️ I found having a controller allowed me to achieve considerably higher output temperatures as it stagnated the water in the collectors. But in your case that may not be necessary if your not heated a lot of water to high temps.
Can you talk about how to prevent freezing in wintertime in the tubes and the supply/return lines? Also, do the supply and return lines come up through the foundation or via the side of the house? I'm designing a cob/straw post and beam in CT and appreciate your insights.
If you use antifreeze in the lines you should be okay down to very cold temps. this system has a heat exchanger in the water tank to transfer heat from the antifreeze solution to the water. The supply and return lines come in through the side of the house, but are underground from the array to the house. I think either way would work but keeping them underground as much as possible is preferable.
Is that Liang D5 pump? It's usually used for computer water cooling systems and don't handle hot water well. I think they can handle only about up to 60/65C water temp.
Yes I did see some videos where it was being used for computer cooling. I didn't come up with the design for the system myself. I just replaced the pump that was there. But it was very hard to find.
These pump are unreliable.. I would not use them in a system like this. I had a problem with two of those. I changed them for a more standard pump and got no issue whatsoever since.
The Middle East is a hot desert as I understand and probably doesn't need antifreeze. We get 21 below zero F. These are far better at heating than the older flat panels.
I suppose, but you need hot water year round, so a lot of the year it could supplement a water heater. As this house in the video has, there is also a wood cook stove that heats water for the house. This would supplement water heat in the winter when it is cloudy.
I am very aware of that. Pretty much everything is in our economy. There's only so much you can do about that. Better to use tech that is made from fossil fuel that doesn't consume fossil fuel in it's daily use, though. Thanks.
Hi in south africa during winter these systems are worth shit so we rather fit a heat pump with great results.Heat pump heats 200 liters of water to 55 deg c in 30 min during winter.
Our evacuated tube system had a Thermo Technologies USDT 3002 "pump station" with pump and controls. It monitored water tank temps and operated at pre-programed temperatures - so as to not cool the hot water tank when there was no sun. It worked perfectly for years, with no noise and zero maintenance. I did monitor the pressure gauge on the pump station (to see if the system had a leak) and there was a glass sight tube to monitor the color of the antifreeze (food grade). If the color of the antifreeze changes, it was over-heated.
Amazing system,thanks for the share? It has sparked my interest in this technology… This is the first evacuated tube system I’ve been exposed too… very cool!!!!
These systems are can boil water even in cloudy conditions. And with enough thermal storage can easily be used to heat structures.
Hi Dave. I'm from the midwest where there many cloudy days throughout the year. I'd also like to help people in my region take better advantage of sustainable energy rather than fossil fuels. Could you please further explain how these systems can boil water without direct sunlight? Be as specific and detailed as you like. We can't afford another century of wasted energy.
@@Rick-the-Swift The key is to have a big enough water tank vertically orientated and properly insulated. th-cam.com/video/CTpEj5XPpc0/w-d-xo.html
@Will Swift For hot air? A brick heat chest baffled so the flows up and down as the air travels along the length would help. If you are not using the exhaust from a woodstove that is...
That pump is SO noisy I suspect it is spinning in air. That is, you may have air in the system which allows the pump to overspeed. My system used to do this until I installed a purge pump just to remove that air. I also installed a flow gauge so I can actually see the glycol, judge its condition by its colour and measure its flow in liters per minute. If air does cause problems you'll see that because the flow drops to zero.
Those are good recommendations. It is kind of a crap shoot knowing what's going on in the pipe without a flow gauge. I just had to pump until fluid came out the valve that's above the whole pipe run. You'd think that if you ran it with that valve open the air would all settle out of the system. But it could be that is part of the problem. Thanks!
Even a small branch will cut the power down on your pv panel and slow down or stop the pump panel should be in full sun. Solar hot water tubes will boil the antifreeze /glycol/ and gum things up ,gets way to hot when the pump is not circulating properly. Should be tested and changed out with the proper glycol water mix, the tubes are ok with a little shade, tubes are so well insulated snow and ice won't melt off for a long time so having them where you can clean them off easily is a good thing.
Thanks for the info! Yes that's why I had the tubes covered when the pump wasn't working. Didn't want to heat the fluid without circulation. I wasn't sure if the black gunk in the pump was residue from overheated antifreeze, or from bits of the plastic part of the pump flaking off from friction. Clearly the pump was not running smoothly and so might have been causing friction.
Yes, a solar panel will get almost no power with the slightest shade on it. Good to know about cleaning snow off them. Makes sense that they wouldn't heat up, being that they have a vacuum inside. We have to clean off our PVs all the time in winter. I still think it would be possible to clean them with a brush on a pole like we do with PVs.
The tubes can be mounted almost vertical with a slight angle for the winter sun for the snow, personally on a roof I like a flat hot water panels, snow melts off easily, the tubes will stay frosted up pretty hard to clean off, then the tubes are pretty fragile, when reaching up with a pole.
Is this system just heating up a water tank for hot water? Pump should always be running when the sun is out , that extra heat should be dumped into a space where it can be stored, basement, crawl space, concrete slab or even a tank of water with a heat exchanger or just a roll of flexible pipe in the tank, heats up and stores heat for later. Personally I would install another pump and panel in the system, that system is pretty big, it will heat a lot of fluid going through it, then it's a backup so the system doesn't over heat. Pump cost little compared to the system.
@@ronaldsahn9649 This system heats water in a hot water heater tank and there is also a wood stove for supplemental heat in the winter, so the cook stove in the kitchen can be used to heat water as well. Then the system is also connected to radiant floor tubing for heating the house, so the panels and the wood stove heat water for heating the rest of the house with radiant floor tubing. I'm not sure if during the summer it can put too much heat into the system since it's only needed for heating water for kitchen and bath use at that time of year. I would guess it doesn't have a lot of waste or it wouldn't be set to just run all the time the sun is shining.
Maybe if there was an easy way to cover the panels during a snow storm it would be easier to keep them clean.
That's a good system with the heat storage, as large as the system is shouldn't have any problems heating and storing the heat in the floors, looks like the week link is just the volume of the pumping, 2 pumps 2 pv panels would push a lot more heat into the storage and be a good backup and simple. Summer time the system still needs to run and need to dump that heat somewhere else probably be covered with shade cloth during the summer, as long as you have enough hot water. Dumping the heat is a separate problem, but could be used to extend the growing season in greenhouse grow beds, spring and fall when heat is not needed in the house. I've done a lot of work finding leaks in snow melt and in floor heating systems with a thermal camera, if the system is hot you can see all the lines and you will see a leak or a pinched line pretty easy now cameras are pretty cheap to rent seen them at home Depot or borrow from a plumber. I think I paid 700 bucks for the one I got last year, 15 years ago they were 25 grand.
@@ronaldsahn9649 we have that hot water heating system, but we don't have anyone to help us connect, could you help us in any way, if you have any instructions to forward to me?
Wow, so clever. What a great system.
I want something like this for an indoor pool....
Bearing is shot, there should not be that much vibration in that system. Maybe we can print and cast new inline pump.
That particular type of pump had no bearing. The impeller is floating in the fluid as a bearing. The sound you are hearing is most likely from the impeller being out of balance. You could open it again and check each of the channels that leads from the center to the outside of the impeller. Most likely, one is plugged, cutting efficiency, and throwing off the balance.
I think youtube is shadow banning you or suppressing your videos as you have less than 50k subs.
Quality of content is there
Thank you! I just don't post often enough. I'm hoping to turn that around. I want to do more live streams and consistent vlog posts. But it takes a lot of time and work. Usually you need to put in 60-70 hrs a week to really build a great channel. I spend a lot of time just trying to grow my own food and do other work for income that it takes away from video production.
@@HardcoreSustainable believe me, I know how the time goes.
Great video; would you be willing to share how much EV tubes cost and which company you got them from; assuming you are happy with the purchase. Thanks.
Also, does anyone know if a drain-back system could be used (using water) instead of using glycol with the EV tubes?
I don't know about a drain-back system. What is that? The glycol is used so it doesn't freeze in the tubes and rupture the channels.
I can try to find out about the company and cost. They were bought by the person who owns the house...not me.
@@HardcoreSustainable Thank you. A drain back system uses water, not glycol and when the sun goes down drains the water back to the storage tank so the pipes in the collector don't freeze. This system is more effiecient.
@@marksTips466 I see. I'll have to ask the owner how much the evac tubes were.
It is indeed very difficult to clean a pump. Sometimes i use ( not knowing the English word) a vibrator. 😅 No, not that one. One that i also use to clean carburators. When starting it immendiatly the solvent becomes very dirty. So i need to change that 3 or 4 times before the pump is clean.
Last year a friend of mine disconnected his 25/80 Grundfoss pump he has inbetween his wood/central heating system. For almost 6 months.
He firstly let his woodstove burn. Then he remebered to put in the pump for power. And his stove was allready boiling. Needless to say the pump did not start because all the sediment clocked up. So stupid. Because i had installed a pumpprotection. So that the pump would automatically start at 30 degrees Celsius. And also every 24 hours would pump for 15 minutes. But he even wanted to save himself that very small amount of money. 😢
Took me 5 hours to get that pump working again. A 400.00 Euro pump. And he even was angry at me because i had installed everything 8 years ago (for free). He has not even one clue how it all operates. And after explaining for almost one hour that if a pump does not turn for several days that sediment can get the pump stuck i stopped explaining. 😢 The story is. Never help friends who have not the slightest understanding how something does work. And also such a wood / central heating system can become dangerous. Especcially when a houseowner so once a while does not check the safety appliances that are build into it. Made a 97 degree Celsius thermal valve that can cool a stainless steel ringtube inside the heat-exchanger. But he had that closed off. 😢 So he had only his 3 bar pressure release-valve. It became very messy and he also was mad at me because of the scare noise it made. After i told him to be happy that he did not blow up his wife and kids i had to go. While he shouted that he would hire a pro. It is better for some ppl to not own such systems. At my house i allways keep some braincells focussed towards how it operates. Also to prevent troubles.
Lately i am thinking to add vacuumtubes or solarpanels. To heat the 500 and 6000 liter boiker i have. But still not sure what the best option is.
I live at the countryside and solar also would give me some electricity. I then would need to add a electric heatexchanger to the boiler. To warm up the 6000 liter boiler i probably would need a lot of panels. Maybe vacuumtubes would give more rendament ?
That is why i am watching some YT video's.
I'm not sure what to recommend for you. The vacuum tubes could bring the temp up and then the water heater could bring it up the rest of the way if it's not hot enough. This system in my video does have a hot water heater tank inside, but I don't know if it does anything but hold the water. It also works with the wood cook stove in winter to heat the water, so there are multiple sources of heat for the water.
If you alternate the current of 12v or 24v systems (the solar panel getting some light, little light, and no light), you will burn even the bests of motors. Sounds like a brushed motor that has overheated. You should back up this motor with a 12v battery and let the solar keep the battery charged while you run this motor.
I do think the motor overheated and part of it melted.
I wonder how that battery system would work with the evac tubes though. because if the motor doesn't only turn on when there is sunlight on them and the PV panel powering the motor, you will unheat the water in the water tank by circulating the fluid through the unheated evac tubes. It would definitely have to turn off at night, but in winter it could cool your water very quickly. I see your point, but how would you deal with that situation?
@Erik Slagter Good advice, Erik. I have an Art-Tec differential controller.
Seems like the noise is just a vibration of something. May just tighten everything or look for loose parts
“You don’t need fossil files” so how did they source the materials?
"I'll probably clean it with solvents"
Any chance of getting basic design of the system I’m attempting a similar system.
... Cool. I guess solar tubes can heat water, but need the fancier vacuum tubes to get 300F water on sunny days to heat entire house air and all.
Yes the vacuum tubes prevent heat loss.
@@HardcoreSustainable .. Thanks for reply ... I always wondered if mirrors or just huge white billboards could without complex fluids bounce enough sunlight into house windows, , , Sure beats our medieval ancestors basically hibernating for 6 months till cld plant crops, poor bastards,,,
What kind of controller are you using? I am using a Tekmar 157 with a variable speed pump and it is getting a lot more usable energy out of my panels than the previous owner did. I'm not sure if there's a 12V equivalent though.
I don't think this system has a controller. The pump goes on when the sun is shining and circulates the coolant liquid. It heats the water in the water heater. When the system is on during the winter, excess heat has to be circulated through the radiant floor tubing in the floor or otherwise dumped somewhere or the pressure valve on the water heater will blow. But this doesn't happen because of the evac tube system, it happens because both the evac tubes and the wood stove are being used to heat the water in the water heater. It's not hard in winter to find ways to deal with excess heat.
@@HardcoreSustainable well it's crude but if it works 🤷♂️ I found having a controller allowed me to achieve considerably higher output temperatures as it stagnated the water in the collectors. But in your case that may not be necessary if your not heated a lot of water to high temps.
Amazing ideas
in israel we have a simpler design that is mandatory in all homes 40 years ago
Awesome
Hello and good evening who makes the solar panels you are using
Can you talk about how to prevent freezing in wintertime in the tubes and the supply/return lines? Also, do the supply and return lines come up through the foundation or via the side of the house?
I'm designing a cob/straw post and beam in CT and appreciate your insights.
If you use antifreeze in the lines you should be okay down to very cold temps. this system has a heat exchanger in the water tank to transfer heat from the antifreeze solution to the water. The supply and return lines come in through the side of the house, but are underground from the array to the house. I think either way would work but keeping them underground as much as possible is preferable.
Is it costly to get installed ?
also yeah also its spinning the wrong way. centrifugal pumps spin with the current of water
Is that Liang D5 pump? It's usually used for computer water cooling systems and don't handle hot water well. I think they can handle only about up to 60/65C water temp.
Yes I did see some videos where it was being used for computer cooling. I didn't come up with the design for the system myself. I just replaced the pump that was there. But it was very hard to find.
Cool
It gone warm only in the thank?
These pump are unreliable.. I would not use them in a system like this. I had a problem with two of those. I changed them for a more standard pump and got no issue whatsoever since.
Use flat panels. No antifreeze coolant and no pumps. The entire middle east uses these on every house to get hot water.
The Middle East is a hot desert as I understand and probably doesn't need antifreeze. We get 21 below zero F. These are far better at heating than the older flat panels.
and when its -20c what do they do??? or what would they do?
That pump definitely sounds way too loud. Those inline pumps should be almost silent.
Yep. I think it needs to be replaced. It sounded loud even detached from the system when I was testing it.
Already mass produced and on most rural houses in China.
Wow, that's amazing. I didn't know that. Almost no one has them in the US.
Unfortunately, the sky is almost always overcast during the winter in central Ohio, so this kind of system wouldn't provide as much benefit here
I suppose, but you need hot water year round, so a lot of the year it could supplement a water heater. As this house in the video has, there is also a wood cook stove that heats water for the house. This would supplement water heat in the winter when it is cloudy.
Hey at least they put the pump in an easily accessible spot........NOT
Right, it's a pain to try to get to.
One look at the design of the house and I know this is not exactly for my climate. Snow would destroy that roof hahaha
Hahaha
Just remember it still takes fossil fuels to make everything your using...great video.
I am very aware of that. Pretty much everything is in our economy. There's only so much you can do about that. Better to use tech that is made from fossil fuel that doesn't consume fossil fuel in it's daily use, though. Thanks.
It took fossil fuels for you to type that comment. It takes fossil fuels for you to exist. What's your solution?
Hi in south africa during winter these systems are worth shit so we rather fit a heat pump with great results.Heat pump heats 200 liters of water to 55 deg c in 30 min during winter.