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Old 01-17-10, 12:08 PM   #1
frank spina
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Default hot water from my coal stove

i placed a 40 gallon tank on top my coal stove and preheat water before going into my hot water heater. i did this 3 days ago and have had my water heater shut off and i am getting all the hot water i neeed. frank

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Old 01-17-10, 02:22 PM   #2
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I used to heat hot water with wood and coal.. But, went to Solar hot water
and liked the fact there wasn't any clean up to perform.
I think that system lasted 15-17 years before dying.



My multi-fuel boiler is just burning oil these days..
Heating both my domestic hot water and providing heat..
I'm waiting for a new heatpump unit to arrive. Hoping it's here before April..
And the end of the real heating season.


This one had a leak..
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Old 01-17-10, 10:57 PM   #3
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Don't forget that you can wrap a water line around the metal part of your chimney as well to capture that heat as it's otherwise lost.
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Old 01-18-10, 08:27 AM   #4
frank spina
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Default water heater

here are some pics, low tech but effective. the cold water is diverted into the tank on the stove and comes out heated and goes into the cold inlet on the water heater. supplys all my hot water for 3 people.
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Old 10-13-11, 01:21 AM   #5
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Default hot water from my coal stove

hi,
Good idea
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Old 10-14-11, 05:46 AM   #6
The master plan
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This is my low tech hot water heater. I put some pipe in my wood stove and connected a small circulator pump up to it. It's controlled with a snap disk to turn it off and on. From there it's pumped into an old 60 gal. solar water heater.


Last edited by The master plan; 10-14-11 at 05:49 AM..
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Old 10-14-11, 10:43 AM   #7
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How does it work out for you?
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Old 10-14-11, 01:27 PM   #8
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I get all my hot water from it in the winter. It heats the water in a couple of days of good burning to 140F and gets as high 180F at times. (Great for washing dishes in the dishwasher!) I could insulate the tank better than it is now to retain the heat longer but I never run out of hot water with it unless I leave for the weekend or don't burn for a few days.

All in all it cost about $200 in parts including the tank. (Found in newspaper ad) It saves me $10 in electric five months out of the year.
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Old 01-19-12, 10:12 AM   #9
abogart
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Quote:
Originally Posted by The master plan View Post
This is my low tech hot water heater. I put some pipe in my wood stove and connected a small circulator pump up to it. It's controlled with a snap disk to turn it off and on. From there it's pumped into an old 60 gal. solar water heater.

Very nice setup! What are the inlet/outlet temperatures? I have been thinking about doing something like this with my woodstove in the garage and pumping hot water in to heat the house, like those outdoor boiler setups. I just wonder if that setup transfers enough heat to heat a house.
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Old 01-19-12, 05:33 PM   #10
The master plan
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Inlet and outlet temps stay around the temp of the water in the water heater. The whole system holds less than 4 gallons I'm guessing.

The pump is a three speed circulator pump set on the lowest setting. I'm guessing I could have put in more pipe in the firebox or need a smaller/slower pump. Some set ups use convection and I wanted that way but it just wouldn't work in this set-up.

Overall I am very happy with the results and it has more than paid for itself already.

Right now I have 3 extra people and 2 kids staying here and it doesn't keep up with the demand put on with the showers and dishwasher. But it is preheating the water going into the electric 40 gallon water heater to 90F to 110F...now I need to get rid of the extra people. lol


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