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Country Discussion Topics
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Hot water
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Lazy Al    Posted 12-18-2003 at 08:15:10       [Reply]  [No Email]

I finally got anold water heater hooked up to my wood furnace . I rerouted the cold water going to my electric one thru this one . Then came out of the bottem element hole up thru some black pipe in the furnace then into the top element hole . I put unions as it comes out of the wood furnace with shut offs so I can change that pipe . put a 210 deg 150lb pressure releif valve on the water heater and a 125lb in the line going to the furnace after the shut offs so if some happensto turn off one of those valves it could release pressure there .
I don't expect to have the electric one to come on all winter . then in the summer it will temper the water before it goes in the electric one .
The BIL has a set up like this and his works great and so far this one has too .

Jimmy    Posted 12-19-2003 at 11:25:22       [Reply]  [No Email]
Great idea, use the two electric element entry points for pumping water from the furnance & the existing hot water hook ups are isolated for heath reasons- An isolated heat exchanger. Great, now you got my foot tapping....

CAH    Posted 12-18-2003 at 15:20:40       [Reply]  [No Email]
How long have you had it up and running? I don't see any circulating pump, I assume it is thermocycling? Does it have any problem "pulling" the cold water up? Lastly, is the black pipe in the firebox or between the firebox and the outer jacket. There is a huge temp difference between the two and when I do mine I plan to stay out of the firebox.

Mike D.    Posted 12-18-2003 at 12:50:19       [Reply]  [No Email]
I like what you have rigged up Al. Worry about the pressure side of it though. It isn't a worry if that outfeed is 3/4", right?

It must have taken years- given yer handle....

I'm considering 1/8" plate for saddle tanks on our stove. Now I'm using a coil that is mounted just above the flue elbow with a reflector above it. Lots of condensation on my stuff though. Feed tails right out of the pressure tank. Big transition in heat range between it and the top of the flue elbow. Go figure.

deadcarp    Posted 12-18-2003 at 08:51:48       [Reply]  [No Email]
I'm all for grabbing house heat to heat water but i do have one concern: i'm a little leary when i see copper pipes going anywhere near an actual wood fire cuz temps are so unpredictable. i wouldn't hesitate to grab heat from a coil in a duct or plenum. without knowing exactly where the pipes go, it might work good. if everything circulates right, you can consider the combined tank capacities as thermal storage. see the hazard is - just in case, are you sure the old tank and the rest of your plumbing will take 125 psi?

as far as how much heat and how much storage is enough: i remember when butchering pigs years ago - we'd setup a 55-gallon scalding barrel and start a fire under it - in the time it took to do chores, that barrel would be boiling, so 55 gallons ain't nearly enough to absorb the heat from a fire. (300 gallons is a decent minimum.) oh, and be sure and hook an open blowpipe from the relief valve clear to outdoors - steam is pretty unforgiving stuff! :)

Al    Posted 12-19-2003 at 05:06:37       [Reply]  [No Email]
Back in the fifty's my folks had this big old furnace that burned coal and wood . It was like five foot dia and had big round ducts comming off it . He had a factory made loop in there to heat hot water in the winter and then a little bucket a day boiler for summer . Never seen it blow off the pop off .
I have that 210 deg valve on it too , just like on all hot water heaters . so I hope I'm OK as far as that goes . I've had it going for several days now with some pretty hot fires and the hottest the water temp was is 180 deg .
Made the loop out of 3/4 black pipe two 18 inch tied to gether with a 3 inch and I used M copper on the out side and it's away from the fire box on the outside of the jacket . I put the black pipe in the fire box and if I run into trouble I could make a shorter loop or put it outside the fire box . So far it's working great, by comming out of the bottom and and going up thru the heating part and in the top it circulates by it's self . When I filled it and started the fire back up , it wasn't long before the top was warm and the bottom was cold so it started circulating right away . took a while before they both was hot . It only took a day and a half to do it the lazy part is my wife's opinion not mine, I think I work real hard . But I do it here where she still works out . Has 188 more days before she retires . My life will change for ever . I like doing my thing by my self .
Thanks for your concerns

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