The newer US high efficiency gas furnaces are condensing, I have a second gas furnace in my unheated attic, I was not able to put in the highest efficiency furnace because it was condensing, and the condensate would have frozen in the unheated space. You can recognize a condensing furnace by the use of horizontal rather than vertical vents. So much heat is extracted from the hot gas that there is not enough to rise out of a vertical vent, so it's vented horizontally thru PVC pipe.
Michael Payne > [Original Message] > From: MightyChimp <[EMAIL PROTECTED]> > To: U.S. Metric Association <[EMAIL PROTECTED]> > Date: 22/5/04 20:44:23 > Subject: [USMA:29914] Re: kWh for gas > > Maybe so, but American furnaces don't. American furnaces just heat the air > and a fan blows it through the house. No radiators or boilers, at least in > newer homes. People who have had radiator heat say it is too hot. > > Also, the US has not caught on to the more efficient demand water heating > system. Water is heated in a big tank and stored until usage. As the water > cools, it has to be re-heated, which means a waste of energy. Because the > demand heater system is considered "foreign" it isn't even considered in the > US. I don't even think one can be brought to the US from Europe and even if > you got it in, you could not connect it as it would definitely not have US > approvals. > > Anything that saves energy and cuts into energy profits is un-patriotic and > un-American. > > Euric > > ----- Original Message ----- > From: "Chris KEENAN" <[EMAIL PROTECTED]> > To: "U.S. Metric Association" <[EMAIL PROTECTED]> > Sent: Saturday, 2004-05-22 10:57 > Subject: [USMA:29907] Re: kWh for gas > > > On Wednesday 19 May 2004 21:34, [EMAIL PROTECTED] wrote: > > 2004 May 19 > > RE 29846 > > e-mail 29846 reports that gas is billed in kWh in the UK. > > This is bad news. In the US kWh is restricted to electricity only. > > When it was changed from therms a few years ago they deliberately chose kWh > to > make comparisons easy with electricity prices. Not good SI, but I understand > the rationale. > .. > > Note that gas energy is billed for its higher heating value. That is > > the energy delivered if all the water vapor is condensed to get out > > the heat of vaporization. Residential furnaces do not condense. > > Oh yes they do! Condensing boilers are sold in Europe as the most efficient > way of heating. They become compulsory in the UK in a couple of years' time, > I believe. > -- > Chris KEENAN > UK Metric Assoc.: metric.org.uk --- Michael Payne --- [EMAIL PROTECTED] --- EarthLink: The #1 provider of the Real Internet.
