Wood Stove Heat Exchangers

[Whitenuckler]

Saw this on FB. Actually looks like there was some thought put into it. Some of the parts reminds me of my oil burner/hot water heating system now just taking up room and not used anymore.

 

[blades]

looks like it is feeding back into domestic hot water supply unless there is another heat exchanger not in the pic

 

[Whitenuckler]

Another good idea?

 

[MRD1985]

I’d be curious about flow rates on how to pull the most heat out of that stove for hot water. Water may flow too fast to heat it enough

 

[TreeCo]

I've found that with my Jotul F600 CB that I can't draw any heat from the chimney without affecting draft. I did something as simple as turning the heat powered fan that sits on the wood stove so it blows on the chimney. That was enough to make the stove not run property and very difficult to reach good running temperatures. If the fan blows into the room the Jotul runs fine.

So I'd be worried drawing heat from the copper wrapped single wall chimney would act in a similar fashion.

Your set up may behave differently.

I've got 15 ft. of 6 inch I.D. Metalbestos stainless steel chimney. That the minimum Jotul recommends. Inside there is three ft. of single wall steel chimney pipe.

 

[Whitenuckler]

I've found that with my Jotul F600 CB that I can't draw any heat from the chimney without affecting draft. I did something as simple as turning the heat powered fan that sits on the wood stove so it blows on the chimney. That was enough to make the stove not run property and very difficult to reach good running temperatures. If the fan blows into the room the Jotul runs fine.

So I'd be worried drawing heat from the copper wrapped single wall chimney would act in a similar fashion.

Your set up may behave differently.

I've got 15 ft. of 6 inch I.D. Metalbestos stainless steel chimney. That the minimum Jotul recommends. Inside there is three ft. of single wall steel chimney pipe.

When I saw that picture of the guy who wrapped his stove pipe, I thought that might be a bad idea asit would cool the pipe down. If it were double wall that may help, but then the water won't get hot. I was also wondering how much circulation you would get into that tank if there were no pump? BTW I have a pellet stove, but when I see these pictures come up on Facebook it gets my attention. If you had a cabin with just a woodstove, you would like to be able to heat up water.

 

[stoveliker]

But unless you have a no baffle smoke dragon, taking heat from the pipe is not ideal (barring wide open burns in cold snaps).

Heating up water in a pot on top, though for showering that gets really camping -like 😜

 

[EbS-P]

I’ve often wondered what a large storage take would do near the wood stove. Say 200 gallons. Water would be fed right into the tank come to room temp or warmer before being heated in the heated hot water heater. We get water as cold as 55 degrees during cold snaps. A 30 degree increase would make the hot water heater consume less energy.

 

[Whitenuckler]

I’ve often wondered what a large storage take would do near the wood stove. Say 200 gallons. Water would be fed right into the tank come to room temp or warmer before being heated in the heated hot water heater. We get water as cold as 55 degrees during cold snaps. A 30 degree increase would make the hot water heater consume less energy.

Ya I have my basement at about 70F, and temperature regulated. If I had a tank that feeds my hot water tank instead of feeding it cold city water I would get free energy unless the water tank cools the room down. Might not need my humidifiers either if the tank was condensing into a drip tray. Probably if you had electric hot water tank with no insulation it would work.

 

[blades]

Double wall flue to ceiling runs about 250 deg.F or more on the out side so wrapping a coil around that and feeding it to the tank type water heater would reduce fuel usage as preheat. not a new idea been around for eons. There is a company that makes just that sort of unit as a one piece assembly that wood replace part of your inside flue.

 

[bigealta]

Ya I have my basement at about 70F, and temperature regulated. If I had a tank that feeds my hot water tank instead of feeding it cold city water I would get free energy unless the water tank cools the room down. Might not need my humidifiers either if the tank was condensing into a drip tray. Probably if you had electric hot water tank with no insulation it would work.

I had this set up in my house. I just plumbed in an older 40 gallon gas water heater to the cold feed to my 40 gallon electric tank.
I look at it as a tempering tank and put it in the Boiler room by the boiler.

Not sure how much it helped especially since i rarely run the boiler, but if it brings up my 50-55F water up 10-15 degrees that's something. WH was free so why not ?

It just started leaking last year so i have the bypass on and the hot and cold shutoffs to the tank, i installed just for this reason, turned off.

 

[Whitenuckler]

I had this set up in my house. I just plumbed in an older 40 gallon gas water heater to the cold feed to my 40 gallon electric tank.
I look at it as a tempering tank and put it in the Boiler room by the boiler.

Not sure how much it helped especially since i rarely run the boiler, but if it brings up my 50-55F water up 10-15 degrees that's something. WH was free so why not ?

It just started leaking last year so i have the bypass on and the hot and cold shutoffs to the tank, i installed just for this reason, turned off.

I have an oil fired hot water heating system (now out of commission) It is on my list to take it apart and get it out of the furnace room. Maybe I can use the tank inside that. The electric one I have will fail eventually and need to be replaced too.

 

[bigealta]

It sure is easiest to just use a water heater. There are lots on marketplace, if you can find a gas one that the gas valve failed and they just replace the water heater vs repairing it, that would be the easiest way to go.

 

[Whitenuckler]

Hottub heater

 

[bigealta]

I think the stoves made to burn right in the water would work much better. My friend has one and it still takes all day to heat up cold water "from the stream" in Vermont in winter.

 

[bigealta]

Snorkel stoves/tubs

Wood Fired Hot Tubs Archives - Snorkel Hot Tubs

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