Hi Danny, without your video I wouldn't even have attempted this - but was able to set up everything first time in under an hour! You are a credit to humanity sir!
Hey Danny. You could have wired up your Nest and gone on to your next job....but instead you took this time to do this video to help others. So thank you! You really helped me here. :)
Massive thank you Danny! When I opened up the boiler and saw that the inside of my Worcester Greenstar 28i Junior Mrk V boiler looked nothing like the neat control boards on all the other TH-cam tutorials my heart also sank. Thank you so much for this video, mine is now all set up and running.
Great video! Worked for me. I have the Worcester Greenstar 30DCI factory fitted built in wireless thermostat. One thing that is critical is to ensure you unplug the wireless module connection from the main boiler like shown in the video with the ribbon cable. If you don’t the the boiler takes the wireless controller input as precedence and doesn’t acknowledge the nest wiring into it. Once I unplugged the ribbon cable the nest worked as it should to call heating for rads! Massive thank you for the video! It saved me from a very frustrating day of working out what was wrong!
Danny. I really appreciate you doing this. I managed to get it all wired up and setup in less than an hour. You have saved alot of people alot of time. Thanks so much. Richard
Thank you so much for posting the video. I have a Greenstar 30Si and received my Nest yesterday after I switched to npower. Don't think I would have worked out where the wires went without your video, especially the loop wire. What a fantastic device!
Danny, you are a star! This video is bang on and got me through what would otherwise have been a lot of fiddling and hoping. I got the Nest installed easily with your help. You are a true gentleman. Thanks.
Thanks for uploading this. I am very grateful as I had given up doing it the night before as I was unsure if I would make a mistake as all of the online videos were for different models of worcester bosch boilers but seeing this gave me the confidence to have another go and I'm happy to say it is all connected and working perfectly. Thanks again.
Brilliant video! Used this to install my hive, along with a wiring diagram from another website. I had exactly the same original timer as you so it was great to see where the screws are to remove the panel, cover etc. Oh, and as a stroke of luck, my original installer left the blanking panel inside the boiler, slightly yellowed :)
Hi Danny, thanks for this. Although it's not working with my Worcester greenstar 28i junior. The heating is staying on constantly... Any ideas? I've wired it up exactly the same as you did. Although, the Worcester smart thermostat I had before was wired into the froststat connections instead.
Hello Danny! Thank you for your video, it is very helpful but I would like to ask you the question regarding the nest smart heating thermostat. Is it still in use in your house? You didn't have any issues with this? What benefits you can get regarding the heating or heating bills or is it just nice visual appearance? Thank you!
Hi Peter, yep I'm still using the nest thermostat and it's great. The ability to turn it on and off remotely was the biggest thing for me, as for the cost benefits it's difficult to say, I honestly couldn't say if I've saved anything with it. It wasn't my primary reason for installing in the first place.
Did u have any issues with the scheduler. I have done exactly the same as you on my matching boiler, it works fine if I manually set the temp but not when I set a schedule
The video is real useful, wonder where can I get a set of the upgrade parts for connection to Nest, i.e. the override parts that fit into the boiler. Thank you.
Thank you. This is almost my exact setup, except I have a digital thermostat. The graphic @ 0:45 tells you everything you need. It's a shame you took the video vertically though.
Thanks v much for this Danny. exactly my boiler and have a 3rd gen nest sitting at home waiting to be installed. this will greatly help. a quick question. and maybe a dumb one. Nest offers hot water control as well. is there a reason you dint use that? is that because this boiler manages hot water supply on demand and hence no control is needed?
That is exactly what I was wondering. I have the same boiler and would like to reduce pre-set water temperature (55 degrees). But not sure if Nest or any other solutions can make water temperature adjustable for this particular boiler. Andy advise @Danny? Great video by the way and thanks for sharing.
Hi Danny, thank you for making the video, I’m hoping it will be enough to guide me through wiring my Heat Link correctly! I’m currently struggling to find out what cable I should use to connect it and if there should be two different types used or not. Are you able to provide any guidance on this please? I’ve got a stand for the thermostat so that side of it should be simple. Any help would be much appreciated!
Hi Jay, I just used some flex 3 core I had lying around (from an old kettle i think) and sleeved the neutral. If you Google 4 core flex though that will do you. Depending on where you are putting the link you shouldn't need much say 1 metre. It's really straight forward once you start but just message back if you have any questions. Danny
I ended up finding out that 1.5mm 4 core would be sufficient. Thanks so much for your video and your help. I managed to fit it to my Worcester 24i Junior successfully and tidily thanks to the 4 core!
bradcla0707 - Hi pal, it threw me initially but on the 28i it was the casing first, 2 screws at the top and 2 at the bottom that sat in casings. Then a central screw and one just to the left of it for the stat panel which allowed the front to be lowered down. Then I could get to the wiring, under 3 screw covering, hopefully its the same on the 24i
Ah amazing, it is. Thanks for that. Now I have realised my second mistake. I haven't bought an extra wire to go from the boiler to the heat link. Crap!
bradcla0707 Nice one! I just used some old flex I had lying around and used the earth and sleeved it to avoid confusion of anyone needs to take it out.
Hi mate I followed your video, I can turn the boiler on and off on at the boiler itself on the controller , But the nest which I wired exactly same as yours and I have same boiler also to mention the nest doesn’t kick boiler on? Any idea mate
Instead of connecting it from the boiler, can it be connected directly from the old timer so there’s no wires showing? My timer is in my kitchen. Also can the nest stat be powered from the old thermostat in the hallway? My old thermostat has 3 wires, a grey, black and a brown. Thanks.
Yep, that's the easiest thing to do if you already have a wired thermostat. I didn't so had to effectively do that what you should already have in place.
Good vid. Got a similar boiler and I couldn't find anything for it at all online regarding a Nest. Had figured it out just about but it's good to have some confirmation before I go ahead and buy it. How has the Nest been for you? Worth the money? I don't have any thermostat at all at the moment so hoping it'll help cut costs over time. Thanks.
Cheers - Yeah its been good, cant say if it will save me money but its something to mess about with. I got it to use with the echo dot but don't really use that, just the app on my phone. Overall its a nice bit of kit but It is depressing to see how long the heating has been on, but at least I am warm and depressed...
Danny Bardsley haha. I am just fed up running around the house changing all the TRV's constantly so hoping a central thermostat will make life a bit easier. Being able to turn it on and off as and when from phone should come in handy as well. Just waiting for a decent deal on one now rather than paying full rrp.
Yeah I got mine through the Npower deal which is the cheapest I've seen although B&Q seemed cheap with all the codes you can stack against it. One thing I have just thought of is where you place the thermostat as this will govern the houses temperature - I moved mine 3 times before I ended up having a happy warmth all around the house. Ideally you'd have a smart valve stat on each radiator but not at them prices!
Danny Bardsley Yeah I've been wondering where to put it. Definitely going for it on a stand so it can be moved around and not stuck on a wall. Will check b and q, get emails from them all the time with money off. Cheers.
I just installed a nest on a Bosch Combi 5000 37W (Australian model) which is almost identical to the 28i in the UK. Following the wiring diagram in your video was very helpful. However on the first night the hydronic panels got very hot, way hotter than with the factory thermostat, and almost too hot to touch. Anyone else had similar experiences?
Hi Nick, I assume you mean the USB power lead? Its 1.5 meter: nest.com/uk/support/article/What-can-I-do-if-my-Nest-Learning-Thermostat-power-cord-is-too-short-to-reach-the-power-socket
Hey Danny, thanks for this video, super helpful! Do you have a clearer copy of the diagram? I'm trying to take a screenshot of it through the screen but if you have a link that'd be great.
Thanks for the video. I've got a Worcester 28i Junior, and the only thing I was thinking of doing differently was leaving the "Analogue Clock" timer (a MT10 unit) only leaving it in place and continually on, and just rewiring the thermostat "L/N/L(s)" into the Hive unit. It's more or less how you have done the Nest, but I don't see how you've disconnected the timer unit you had (I'll watch again, but feedback on my wireing idea would always be appreciated!).
Does anybody know if it is possible to preheat the on board hot water tank using the nest thermostat with a Worcester 30si. Or does it lose its ability to have on demand hot water?
Just a note of caution for all you diy guys out there the second you take the case of that type of boiler you must now do certain safety checks within the gas regulations such as test safety device and emissions test once the case has been replaced am guessing you all like a wee gamble trying to save a few bob doing it yourself and i know the feeling but honestly you are opening yourselves up to a lot of problems you dont know about if you are not gas safe .
James S I didn’t think you would be messing with the boiler gas burner box, Only removing the lid and opening the controller board, Would I need a gas safe engineer to re test the boiler ?
if you remove the boiler case on a room sealed boiler like the chap in this video you have to be gas safe registered to put back and switch on the reason bein you do not know if you have affected the combustion of the appliance ,you need to test with an analyser and test safety device also you would need to gas rate the boiler per gas safety regs as soon as the case is removed you are now officially worked on the boiler and have to do many checks
I'm an industrial commercial gas engineer - so I don't even need a domestic / remedial ticket and I charge you with scaremongering bollocks. The man went nowhere near the gas control or pipework carrying gas.....so don't get your panties damp worrying about it....
Gus you need to go back to school sweet cheeks read the gas regs thats usually a good start then come back to me, he opened a room seal boiler whats the minimum checks thats required then numb nuts
Note to any customer having work done by above engineer immediatly have it rechecked this is a very worrying situation hes quite happy to just put a room sealed boiler case back on and walk away without any tests apart from cross his fingers scary that this type passes industrial commercial gas, i charge you with incompetence .
If only if he common sense he would of turn his android phone to landscape so you can see what the hell 😂he was trying to show in the diagram hahahahahahahaha why do people do that,, we don’t have Tv or computer screens sitting on our desk in Portrait,, hahaha it landscape displays equals WIDESCREEN 16.9 aspect ratio 😊… had to skip ,, not gonna waste my time watching this crap if you can’t film it properly…
Does anybody know if it is possible to preheat the on board hot water tank using the nest thermostat with a Worcester 30si. Or does it lose its ability to have on demand hot water?
Hi Danny, without your video I wouldn't even have attempted this - but was able to set up everything first time in under an hour! You are a credit to humanity sir!
Ha ha, glad it helped 👍
Hey Danny. You could have wired up your Nest and gone on to your next job....but instead you took this time to do this video to help others. So thank you! You really helped me here. :)
Massive thank you Danny! When I opened up the boiler and saw that the inside of my Worcester Greenstar 28i Junior Mrk V boiler looked nothing like the neat control boards on all the other TH-cam tutorials my heart also sank. Thank you so much for this video, mine is now all set up and running.
Ace, glad you got it sorted!
Great video! Worked for me. I have the Worcester Greenstar 30DCI factory fitted built in wireless thermostat. One thing that is critical is to ensure you unplug the wireless module connection from the main boiler like shown in the video with the ribbon cable.
If you don’t the the boiler takes the wireless controller input as precedence and doesn’t acknowledge the nest wiring into it.
Once I unplugged the ribbon cable the nest worked as it should to call heating for rads!
Massive thank you for the video!
It saved me from a very frustrating day of working out what was wrong!
Danny. I really appreciate you doing this. I managed to get it all wired up and setup in less than an hour. You have saved alot of people alot of time. Thanks so much. Richard
Glad it helped Richard 👍
Thank you so much for posting the video. I have a Greenstar 30Si and received my Nest yesterday after I switched to npower. Don't think I would have worked out where the wires went without your video, especially the loop wire. What a fantastic device!
Glad it helped and saved you paying for installation.
Danny, you are a star! This video is bang on and got me through what would otherwise have been a lot of fiddling and hoping. I got the Nest installed easily with your help. You are a true gentleman. Thanks.
Cheers Ian, glad it helped.
Excellent video - cheers! My heart also sank when I saw the wiring was completely different. This also works with a Greenstar 38Cdi version.
Cool, glad it helped you!
Thanks for uploading this. I am very grateful as I had given up doing it the night before as I was unsure if I would make a mistake as all of the online videos were for different models of worcester bosch boilers but seeing this gave me the confidence to have another go and I'm happy to say it is all connected and working perfectly. Thanks again.
Nice one, when i first got it there wasn't anything really that showed you what to do (loads now though) so glad it helped!
Thanks a million for this. All set up and working. Top man for making a video.
Excellent, glad it helped you out 👍
Life saver, just followed this video and it works perfectly. Thanks for your help!
You really saved me there. This was exactly what I needed. All up and running thanks to you.👊🏻
Glad it helped!
Thanks for this mate! Exact same wiring for my Worcester Greenstar 30Si.
Thank you so much for this video, it would have taken me ages to figure this out!
👍 glad it helped
Many thanks amazing that helped tremendously now got my nest up and running thanks for the wiring diagram.
Brilliant, glad it's helped you 👍
Nice one geezer. Worked straight away. 👍🏻
Brilliant video! Used this to install my hive, along with a wiring diagram from another website. I had exactly the same original timer as you so it was great to see where the screws are to remove the panel, cover etc. Oh, and as a stroke of luck, my original installer left the blanking panel inside the boiler, slightly yellowed :)
Result! Glad it helped, a friend of mine is looking at a hive stat so I'll let him know.
Very helpful. Thanks for taking the time to make the video and share the diagram.
Glad it helped James 👍
Thanks mate, your video helped me install the Nest on my 30si today, your instructions were spot on 👍🏻
Kevstir2000 - result, glad it saved you some £'s
Such a legend for putting this together! Thanks a lot Danny!
Glad it helped! The Nest really is a cracking bit of kit.
Hi Danny, thanks for making this video - helped me out of a pickle with my greenstar and nest.
That diagram is all you need really. Excellent video! Thanks.
No worries!
Thanks so much for this video and wiring diagram. Worked perfectly for my greenstar 27 cdi compact
Thank you, very helpful video and got me up and running!
Excellent; worked a treat. Many thanks for this!
Thanks Danny! Your video was very helpful! (Vulcano Eurostarplus boiler)
Thanks for the vid. it was a great help to install my nest
You're a life saver!
Glad it helped!
Thanks mate! Worked for me and saved me some cash. Recommended!
Thank You,my Nest thermostat working perfect:)
Nice one, glad it helped!
Thanks for this video. Made it very easy to install
Hi Danny, thanks for this. Although it's not working with my Worcester greenstar 28i junior. The heating is staying on constantly... Any ideas? I've wired it up exactly the same as you did.
Although, the Worcester smart thermostat I had before was wired into the froststat connections instead.
Cheers Danny! you saved me a headache :)
Been needing this for some, time! Also thanks for the part number for the panel cover, I might just do the disconnect thing however.
Hello Danny! Thank you for your video, it is very helpful but I would like to ask you the question regarding the nest smart heating thermostat. Is it still in use in your house? You didn't have any issues with this? What benefits you can get regarding the heating or heating bills or is it just nice visual appearance? Thank you!
Hi Peter, yep I'm still using the nest thermostat and it's great. The ability to turn it on and off remotely was the biggest thing for me, as for the cost benefits it's difficult to say, I honestly couldn't say if I've saved anything with it. It wasn't my primary reason for installing in the first place.
@@dannybardsley Thank you very much for your reply Danny!
Did u have any issues with the scheduler. I have done exactly the same as you on my matching boiler, it works fine if I manually set the temp but not when I set a schedule
No the schedule works fine for me, have you got the learning thing switched on where it auto sets the heat for you? That might override the schedule?
The video is real useful, wonder where can I get a set of the upgrade parts for connection to Nest, i.e. the override parts that fit into the boiler. Thank you.
Sorry I'm not sure
Danny that's great. That should reach to where I need it. If it was a meter it wouldn't of been long enough. Many thanks.
Really helpful, thanks!
Great job
Thank you. This is almost my exact setup, except I have a digital thermostat. The graphic @ 0:45 tells you everything you need. It's a shame you took the video vertically though.
If the vertical video is the only complaint you know it's a good video 😁😋
massive help thank you
THANKYOU
Glad it helped
Thanks v much for this Danny. exactly my boiler and have a 3rd gen nest sitting at home waiting to be installed. this will greatly help. a quick question. and maybe a dumb one. Nest offers hot water control as well. is there a reason you dint use that? is that because this boiler manages hot water supply on demand and hence no control is needed?
Hi Umer, Absolutely - as its a combi boiler there is no water tank, the boiler does it for you.
Appreciated :)
Could you use the water control to override the eco setting (if you boiler has that) so it has a warmed header for morning/evening washing?
That is exactly what I was wondering. I have the same boiler and would like to reduce pre-set water temperature (55 degrees). But not sure if Nest or any other solutions can make water temperature adjustable for this particular boiler. Andy advise @Danny? Great video by the way and thanks for sharing.
Thanks for this.Quick question why do you need a loop between L and 2?
Hi Danny, thank you for making the video, I’m hoping it will be enough to guide me through wiring my Heat Link correctly! I’m currently struggling to find out what cable I should use to connect it and if there should be two different types used or not. Are you able to provide any guidance on this please? I’ve got a stand for the thermostat so that side of it should be simple. Any help would be much appreciated!
Hi Jay, I just used some flex 3 core I had lying around (from an old kettle i think) and sleeved the neutral. If you Google 4 core flex though that will do you. Depending on where you are putting the link you shouldn't need much say 1 metre. It's really straight forward once you start but just message back if you have any questions.
Danny
Thanks for that Danny! Do you know what thickness it should be?
I ended up finding out that 1.5mm 4 core would be sufficient. Thanks so much for your video and your help. I managed to fit it to my Worcester 24i Junior successfully and tidily thanks to the 4 core!
Nice one, I've just seen my link to screwfix didn't post! Sorry about That, glad you got it sorted and saved some cash on installation.
Cheers for the video mate. I'm trying it with the Greenstar 24i. Just wondering how you got the front of the boiler off. I'm really struggling.
bradcla0707 - Hi pal, it threw me initially but on the 28i it was the casing first, 2 screws at the top and 2 at the bottom that sat in casings. Then a central screw and one just to the left of it for the stat panel which allowed the front to be lowered down. Then I could get to the wiring, under 3 screw covering, hopefully its the same on the 24i
Ah amazing, it is. Thanks for that. Now I have realised my second mistake. I haven't bought an extra wire to go from the boiler to the heat link. Crap!
bradcla0707 Nice one! I just used some old flex I had lying around and used the earth and sleeved it to avoid confusion of anyone needs to take it out.
Hi mate I followed your video, I can turn the boiler on and off on at the boiler itself on the controller ,
But the nest which I wired exactly same as yours and I have same boiler also to mention the nest doesn’t kick boiler on?
Any idea mate
You can hard wire the nest thermostat using T1 and T2 to avoid plugging in. That's what I am going to do when I install mine
Could you please provide a diagram how to hardwire it? I would really appreciate it, instead of having a hideous cable running to my boiler. Thanks
Instead of connecting it from the boiler, can it be connected directly from the old timer so there’s no wires showing? My timer is in my kitchen.
Also can the nest stat be powered from the old thermostat in the hallway? My old thermostat has 3 wires, a grey, black and a brown. Thanks.
Yep, that's the easiest thing to do if you already have a wired thermostat. I didn't so had to effectively do that what you should already have in place.
Hi, Ls from the boiler is 220 V AC?
I finally got the loop in (any tips)? And my boiler just stays on even when the stat is off
Good vid. Got a similar boiler and I couldn't find anything for it at all online regarding a Nest. Had figured it out just about but it's good to have some confirmation before I go ahead and buy it. How has the Nest been for you? Worth the money? I don't have any thermostat at all at the moment so hoping it'll help cut costs over time. Thanks.
Cheers - Yeah its been good, cant say if it will save me money but its something to mess about with. I got it to use with the echo dot but don't really use that, just the app on my phone. Overall its a nice bit of kit but It is depressing to see how long the heating has been on, but at least I am warm and depressed...
Danny Bardsley haha. I am just fed up running around the house changing all the TRV's constantly so hoping a central thermostat will make life a bit easier. Being able to turn it on and off as and when from phone should come in handy as well. Just waiting for a decent deal on one now rather than paying full rrp.
Yeah I got mine through the Npower deal which is the cheapest I've seen although B&Q seemed cheap with all the codes you can stack against it. One thing I have just thought of is where you place the thermostat as this will govern the houses temperature - I moved mine 3 times before I ended up having a happy warmth all around the house. Ideally you'd have a smart valve stat on each radiator but not at them prices!
Danny Bardsley Yeah I've been wondering where to put it. Definitely going for it on a stand so it can be moved around and not stuck on a wall. Will check b and q, get emails from them all the time with money off. Cheers.
I just installed a nest on a Bosch Combi 5000 37W (Australian model) which is almost identical to the 28i in the UK. Following the wiring diagram in your video was very helpful. However on the first night the hydronic panels got very hot, way hotter than with the factory thermostat, and almost too hot to touch. Anyone else had similar experiences?
Hi Chris, I've not had anything like that happen - hopefully someone else may have. Glad it helped though, kinda!
Cheers Danny, I've turned the CH controller down on the Combi so hopefully that reduces the max temp to a more safe level.
Danny How long is the lead from the plug in transformer to the Nest Thermostat.
Hi Nick, I assume you mean the USB power lead? Its 1.5 meter:
nest.com/uk/support/article/What-can-I-do-if-my-Nest-Learning-Thermostat-power-cord-is-too-short-to-reach-the-power-socket
Hi. How often to you find you have to charge the thermostat? Or do you keep it plugged in at the wall all the time?
Hi, mines constantly plugged in on the wall.
@@dannybardsley thank you Danny
Should you be putting two cables into one terminal? Ie the live terminal?
Hey Danny, thanks for this video, super helpful! Do you have a clearer copy of the diagram? I'm trying to take a screenshot of it through the screen but if you have a link that'd be great.
Hi mate - glad its helped - I've uploaded a copy of the document here: drive.google.com/file/d/19KBS1LZIEOqDLnRl-2cS7YbMPDB-clpD/view?usp=sharing
Amazing, thank you again!
Hi Danny, can I ask, why did you take a feed for the-heat link from a switch-live in the boiler....?
If I'm watching correctly..?
Gus.
Does not work with opentherm
How does the nest heatlink talk to the nest controller ?
Garry Pollock it's wireless
Danny Bardsley perfect thanks . And does the 3rd generation work with this heat link .
Thanks for the video.
I've got a Worcester 28i Junior, and the only thing I was thinking of doing differently was leaving the "Analogue Clock" timer (a MT10 unit) only leaving it in place and continually on, and just rewiring the thermostat "L/N/L(s)" into the Hive unit.
It's more or less how you have done the Nest, but I don't see how you've disconnected the timer unit you had (I'll watch again, but feedback on my wireing idea would always be appreciated!).
Does anybody know if it is possible to preheat the on board hot water tank using the nest thermostat with a Worcester 30si. Or does it lose its ability to have on demand hot water?
Danny Bardsley, hahahaha no way long time no see mate.
Ha, how did you stumble on this?
@@dannybardsley was looking at how to put one on my boiler pal
@@anthonycullen6127 then look no further 😁
Just a note of caution for all you diy guys out there the second you take the case of that type of boiler you must now do certain safety checks within the gas regulations such as test safety device and emissions test once the case has been replaced am guessing you all like a wee gamble trying to save a few bob doing it yourself and i know the feeling but honestly you are opening yourselves up to a lot of problems you dont know about if you are not gas safe .
James S I didn’t think you would be messing with the boiler gas burner box,
Only removing the lid and opening the controller board,
Would I need a gas safe engineer to re test the boiler ?
if you remove the boiler case on a room sealed boiler like the chap in this video you have to be gas safe registered to put back and switch on the reason bein you do not know if you have affected the combustion of the appliance ,you need to test with an analyser and test safety device also you would need to gas rate the boiler per gas safety regs as soon as the case is removed you are now officially worked on the boiler and have to do many checks
I'm an industrial commercial gas engineer - so I don't even need a domestic / remedial ticket and I charge you with scaremongering bollocks.
The man went nowhere near the gas control or pipework carrying gas.....so don't get your panties damp worrying about it....
Gus you need to go back to school sweet cheeks read the gas regs thats usually a good start then come back to me, he opened a room seal boiler whats the minimum checks thats required then numb nuts
Note to any customer having work done by above engineer immediatly have it rechecked this is a very worrying situation hes quite happy to just put a room sealed boiler case back on and walk away without any tests apart from cross his fingers scary that this type passes industrial commercial gas, i charge you with incompetence .
Thanks for the video... my pump is on overrun all the time.... any thoughts anyone?
If only if he common sense he would of turn his android phone to landscape so you can see what the hell 😂he was trying to show in the diagram hahahahahahahaha why do people do that,, we don’t have Tv or computer screens sitting on our desk in Portrait,, hahaha it landscape displays equals WIDESCREEN 16.9 aspect ratio 😊… had to skip ,, not gonna waste my time watching this crap if you can’t film it properly…
Nice one 👍
Literally no help
?
Does anybody know if it is possible to preheat the on board hot water tank using the nest thermostat with a Worcester 30si. Or does it lose its ability to have on demand hot water?