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Wrong radiator! Use the old cast iron radiators, bigger passageway

As you cool the exhaust it will become much more corrosive so choose materials very carefully & make sure that any condensed liquid will fully drain. If you can get the exhaust really cool, then CPVC becomes an option for the final run to the outdoor vent.

Bro a diesel heater IS THE HEAT Anytime you convert energy you lose some.

great solution , can we make a floorheating in the van or use for shower ? happy xmas everybody !

y pipe the cooler inlet stacking adds to much resistence parallel makes it cool better with out limiting flow rate

Excellent Nathan Merry Christmas & HaPpY New Year 🎉 To you the family & everyone at DTE TV

Cool project... another option would be to just use an air to air exchanger.. Run the exhaust from the diesel heater thru an appropriate sized radiator.. maybe a heater core or something like that.. and have a fan on that radiator. Might need a couple of them to extract all the heat.

Merry Christmas to you Nathan and the family, been a great year of videos, looking forward to 2025 with what ever you do, Top Man. Happy new year for 2025. 👍👍👍👍👍👍

Merry Christmas Nathan to you and your family. Have a wonderful festive break.

Merry christmas from italy. Viao

Happy Christmas everyone, we did this a few nights ago n just sat on regents street for n hr.

Merry Christmas and Happy New Year to you and your family 🌲🌲🌲

Can you run the water the opposite direction and the pump will push water from the top downward through your EGR?

hi what pipe did you use on radiator?

I wouldn't say getting free heat... More like giving away less free heat or in simpler terms.. heating more efficiently

Maybe run the EGR coolers in parallel to improve the flow?

Not 200% more efficient. With flue gas tester, efficient is meassured to 70% on these heaters. If you recover 100% of the waste heat from the burners exhaust, you will reach 100% efficiency. Your title should be: "Diesel heater upto 30% more efficient!! (Great result)" or "Diesel heater, 100% efficient (perfect result)" Your radiator size is perfect, dont use smaller to get the whole radiator hot. Perfectly you need the exhaust from the radiator to be as cold as your room temperature(or combustion intake air temperature). That way you have extracted all heat from the burned diesel and you have reached 100% efficiency.

Just blow the heater hot air through the radiator, it’ll get hotter and save all the plumbing and water leaks. Too complicated IMO

Never seen such a small diesel heater, only 5kw (the 8kw ones are EXACTLY the same as the 5's even inside. As for this radiator setup, once you decide on a plumbing route, consider an adjustable heater output angle... obviously liquids take the longest to change temperature, but once it's warmed up, if you were to adjust or split the outgoing hot air from the heater...and blow it across the radiator...it would increase output the same way a heater core in a vehicle produces heat. So you still have output airflow, but you add that moving air across the hot radiator from the exhaust & now use the radiator as a heater core with a fan behind it.

I think this is a great idea. I have been running a diesel heater for 3 years and have experimented quite a bit. I also have an egr, but I'm not convinced it will work effectively longer than a couple of weeks at the most. The problem is egr's are designed to run at much higher temperatures of an engine. So I fear the cooler with soon get carbon build up, then it would choke up the exhaust port, then you're into a full stripdown and decoke. Good luck and I hope it works. Personally I've opted to run a mix of used cooking oil. Engine oil is a waste of time, its soon builds up petrified carbon deposits.

So depending on how hot you can get the water. Run it through a Honda civic aluminum radiator with a fan blowing through the radiator. Second source of heat through wasted exhaust.

I was always wondering why this isn't a thing. The exhaust temp is like 400f 😂.

That's a damn good idea, I am thinking about getting a diesel heater for my garage and this would make it so much better.

Pump should be on the outlet/return side of the radiator, not on the hot side.

What about using a car radiator instead of the household one? Then fans can be mounted and used to circulate hot air. Admittedly this would be better in a workshop setup

If u put the heat exchangers in parallel off a manifold u would double the efficiency of the system with it going through both and will create a larger area at a higher temperature and try to eliminate any pipes from going up and down air will collect in those areas and create a air lock m8

move the rad to a differnt room

I've added a turbo intercooler from a Subaru to the exhaust of my diesel heater. I chose this because it has metal ends. Most others have plastic ends and wouldn't survive the heat. With a small fan on the intercooler It extracts so much heat from the diesel exhaust that the outlet from the intercooler is barely warm. There's an amazing amount of condensation coming from inside the intercooler that the pipe leaving it needs to run downwards to drain this away.

There's an inherent limit to using a radiator, as it warms up the water you're using steals less and less heat from the exhaust until the rad reaches an equilibrium. If you rigged up a car heat exchanger and fan (may not be needed) it would keep the water closer to ambient temperature, but you would lose the benefit of a nice radiant heat sink.

What about thermo syphon and get rid of the pump?

good thinking

I wonder with a 8kw heater with a manifold/reservoir set up you could probably be able to run multiple rooms. I would probably put thermal wrap around the exhaust and I believe that changing the input/output to more suitable location for an easier convection current to flow.

You have convinced me to purchase a 8 kw diesel heater and a cast iron radiator and copy your set-up procedure. You are doing a great service to show other people that like to try out new ways to save money on heating. I will purchase a higher price unit to get the extra parts and better quite pump. Thanks for the great video to give advice on how to get the best amount of heat from the diesel heaters.

Thanks great test and demo. Thanks.

You need to start again and mount the coolers horrizontal

I have used a 10kw Water heater with 2 egr coolers to heat my jacuzzi. From 7c to 38c in about 2 hours 😁 works great

They are NOT all the same .....spend the extra money and get a LEVANER ........they are DEFINITELY NOT "all the same"

Excellent. I have purchased a dirt cheap EGR cooler online to install on a air cooled petrol tractor I have (it has a enclosed cab).

Ah……Yeah mr cool 😎 guy Nathan 😊 Great video showing what can be done 👍🏻 Looking at the comments you’ve lots on great ideas that’ll keep you working on this project for a while until it’s fine tuned 😀 Happy Christmas 🎄 to you and all your family 🤩

You could probably get away with just one heat exchanger?

Can you have all those curves on the exhaust?

Faaaaaaffffff 😂😂 just loop some metal pipe for the exhaust ! That will emit plenty of the exhaust heat energy ! No pumps ! No water ! No extra 12v power ! Just exhaust pipe ! 😂

Good idea with the egr's, but I would turn the pump around and pull from the radiator. Yes, I would cut and turn them other pipes to be inline like you said.

Hey! Love the vid, 1 thing I would suggest is the water should flow into the bottom of the egr coolers so that it flows up as it heats, and then flow into the top of the radiator so that it sinks down as it cools, this will also assist the pump as the water wants to flow up as it heats and down as it cools, this may also help the pump as the water will cool off in the rad and then flow through the pump, it will also ensure that it always has water to pull from the rad and will never get airlocked, also yes definitely should change the outlet/ inlet setup on the egrs to eliminate air bubbles and help flow, also may be a good idea to raise the radiator so it’s the highest point as it’s open and air can escape there, this could also help by allowing more air into the bottom of the radiator for convection airflow.

You *_must_* use a corrosion inhibitor such as antifreeze because you're using different metals so you'll get cathodic erosion.

I tried exactly this but for some reason the heater didn't like it. Lots of white smoke, unburned fuel, and the heater quit after about ten minutes. Exactly the same radiator as you too. Possibly too much restriction in the radiator, I'm still working on it!

Connect the return from the radiator to the lower (second) egr cooler and the flow to the radiator from the first one for better heat, the way you have it you will not get the best heat transfer from the exhaust.

Hello, not al energy is free. The extra resistance of the exhaust is intervearing with the suplied heat of the diesel heater. More resistence and les free flow. Anyway, its just a minor heat löss.

An alternative to a pressure relief valve would be an expansion tank, either open like old central heating systems or one from a car that is closed with a pressure cap. This would ensure the water system is always topped up.