I agree with Dana 100% almost. I have measured many a furnace with up to 1300 watts, 800 or 1000 watts is normal. But this furnace with larger ducts and a high temp rise (140 discharge) and ECM motor was an exceptionally low draw. This is from memory back in about 2010, I have since had a heart attack with a heavy penalty so my memory may be flawed.
On Thu, Aug 23, 2018 at 6:44 PM Dana <d...@solarwork.com> wrote: > Drake, > > All the conventional units I have amp clamped over the years are pushing > 900-900+ watts per hour. I do not recommend them ever & to date I have > never found a lower wattage blower. I would assume that a permanent magnet > motor would fit this suggestion, but I have not found one. > > For off grid I recommend: Radiant floor heat first and hot water base > board second long before hot air. Air is a better insulator than a heat > transfer agent. > > The new ECM (electronically commutated motors) pump motors are basically > at DC permanent magnet motor power draws [Taco & Grundfoss] these days. > > > > Best of luck with this one. > > > > > ---------------------------------------------------------------------------- > > Dana Orzel Great Solar Works, Inc. > > *C - 208.721.7003 d...@solarwork.com > <d...@solarwork.com>* > > Idaho Contractor - # 028765 Idaho PV # 028374 > > NABCEP # 051112-136 www.solarwork.biz > > *"Responsible Technologies for Responsible People since 1988" * > > *P* Please consider the environment before printing this email. > > > > > > *From:* RE-wrenches <re-wrenches-boun...@lists.re-wrenches.org> *On > Behalf Of *Drake > *Sent:* Thursday, August 23, 2018 2:37 PM > *To:* RE-wrenches <re-wrenches@lists.re-wrenches.org> > *Subject:* [RE-wrenches] Forced air Furnace > > > > Hello Wrenches, > > What is the best choice for a propane, forced air furnace for an off grid > house? We would prefer one that doesn't have a phantom load, although the > transformer for the thermostat may not be avoidable. Low blower current > would be preferable. The furnace AC will be powered by a Magnum 4448 PAE. > > Thank you, > > Drake > > Drake Chamberlin > > > > > > *Athens Electric LLCOH License 44810CO License 3773NABCEP Certified Solar > PV 740-448-7328*http://athens-electric.com/ > > > _______________________________________________ > List sponsored by Redwood Alliance > > List Address: RE-wrenches@lists.re-wrenches.org > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out or update participant bios: > www.members.re-wrenches.org > >
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