On Tuesday, January 27, 2015 at 11:43:24 PM UTC-5, micky wrote:
On Tue, 27 Jan 2015 14:45:26 -0800 (PST), wrote:

I have a 2001 Burnham V8(oil burner hot water) with energy
efficiency between 78-80%. Is that good for its age?

I know more about oil than gas.

When I divide the output BTU's*** by the input BTU's on my 1979 Carreir
oil furnace (hot air), I get about 80%. ***As listed in the owner's
manual that came with the furnace, and is online too.

When I was shopping for a new furnace a couple years ago, the efficiency
of all of them** was about 82%. (iirc but at any rate, little higher
than my furnace rating.)

People here at the time did not believe me that the efficiency has gone
up so little.


People didn't believe you because you were wrong. I replaced my nat gas
furnace back in 2010 with a 93%. There were other units available that were
even slightly higher. All of that was available from all the typical
furnace manufacturers. 90%+ furnaces have been available for at least
a decade, probably a lot longer. The essential big change was when they
went to *condensing* direct vent ones. There was a lot of energy in that
steam that went up the chimney.