Outdoor Wood Furnace Info
All-Purpose OWF Discussions => General Outdoor Furnace Discussion => Topic started by: reco31 on September 10, 2010, 09:47:07 PM
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Hello everyone,
I've been keeping an eye on this forum for awhile now. I just purchased a new owb to replace an old homemade job and am going
to be installing about 80 feet from the house and also about 4 to 6 feet below the h/x. Now from what I've been reading I'll need a
check valve at the outlet. There is one pump inside the house already, so do you think I'll need another at the boiler? It is an
atmospheric design. I am putting some gravel down and then will pour a pad.
Thank you
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My h/x is 187' from the stove with about 6 feet of lift. I dont have a check valve. I use one pump (Taco11) mounted at the bottom of the stove.
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my outside wood furnace is 90 feet from my house and all I run is a taco 007
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mattynh, im scratching my head thinking how a 007 is doing it for ya. have you taken temps of water going in and out of your hx. do you use 1''pex lines?.......still scratching.
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Rosewood I have 1" pex lines..007 pump works great..my indoor oil burner temp reads pretty much the same as my outdoor furnace.. my buddy has the same furnace.. He could use a 011 taco pump cause of the grade between house and furnace....send me a email if u have any other questions
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matty i agree with rosewood . you must be running your taco 7 almost to its limits. When your house is calling for heat from your outdoor boiler your water going back to the OWB must be about 30 degrees cooler?
With all the info on the taco site you shouldn't be doing much better than about 5 or 6 GPM ?
Its working, that is great by all charts available it shouldn't be LOL
I have often wondered if it makes a difference that we all are not under pressure? (the stove that is)
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mattynh, why i ask about temp in/out of exchanger ,i if to cold on out you could ''shock firebox'' dont know how much water your furnace holds,with less capacity this is problem. also sizing pump makes unit more effiecent. not trying to be a know it all,i learned the hard way about sizing pumps $$$$$
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well i know my furnce and central boiler come stock with 007 pumps...I dont have heat exchangers..(hot air I would need a heat exchanger) My system is a sealed system..Runs the same psi as my oil furnace (10 -15 psi)..Not sure why would my 007 pump is maxed out.. i have 007 pumps on my oil furnace they pull a lot of water if i was heating with just oil..My furnace hold only 59 gallons of water..Less water way faster recovery than a furnace that hold hundreds of gallons of water..Hydronic wise..makes sence
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well i know my furnce and central boiler come stock with 007 pumps...I dont have heat exchangers..(hot air I would need a heat exchanger) My system is a sealed system..Runs the same psi as my oil furnace (10 -15 psi)..Not sure why would my 007 pump is maxed out.. i have 007 pumps on my oil furnace they pull a lot of water if i was heating with just oil..My furnace hold only 59 gallons of water..Less water way faster recovery than a furnace that hold hundreds of gallons of water..Hydronic wise..makes sence
it is not you water amount or recovery time that concerned me matty, it is the distance you travel with your water. 90 feet each way is 180 (close to 200) and with most charts, with one inch lines, friction in your pipe (not counting any elbows, tees, filters, zone valves and such) that equates to about 18 feet of head at 10 gpm (normal btu range for a home at about 180 degrees) your taco 007 (by tacos site) can only go as high as 8 feet of head at 10 gpm and does not even chart above about 11 feet of head at 3 gpm
i guess taco really downgrades their pumps so they don't have complaints?? or my figuring is way off (highly possable)
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those figures are for 1 inch lines
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well about the 007 pump on a oil furnace.. A lot oil furnaces have 1 007 pump that circulates water for 2 zones plus..Measure that copper piping with elbows , tees etc.. It could easily be the same distance as my outside furnace..(depending on style of house) If both zones are calling for heat..That pump gotta keep up with demand.. Pretty rare that u see higher pump than a 007 in a house
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im not doubting you...it is working...just came up as a red flag when i seen it. must be figuring wrong on my end
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So guys, from what I gather one pump should be sufficient. I'm not exactly sure what model of Taco pump i have inside, I'll check
when i get home after work and get back to you.
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Sorry, another newb question,
There is an aquastat on the inlet line just before it enters the plenum to the h/x, I'm not exactly sure what this is for?? I have 2
thermostats upstairs, one is for the forced air blower and electric heater in the furnace to come on and the other is for the blower
only to come on (water to air h/x). Just moved in not too long ago and trying to set things straight, first time dealing with this stuff, just
burnt wood inside for 25 years so forgive my ignorance. thanks again
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What is the aquastat connected to? Sound to me that it is being used to switch in a backup heating system in case the boiler water drops below the set temperature.