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Author Topic: House plans  (Read 14064 times)

MaineShark

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Re: House plans
« Reply #30 on: February 24, 2009, 06:48:58 pm »

Needed sealed combustion. Wanted condensing unit. Needed very small size btu output.

Plenty of options on the market for that...

The Heatmaker is not a condensing boiler, BTW.

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That's a gas-fired residential boiler, not a "hot water tank."
Actually both but primarily it was for hot water usage for me.

Actually, that's a boiler.  The fact that it can also generate domestic hot water is not really special - pretty much every boiler has some way to generate domestic hot water.

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in terms of reliability and efficiency
I didn't have any problems. 87% AFUE for non-condensing unit.

AFUE is a near-meaningless number based upon test standards that the Feds invented.  Those standards do a poor job of testing hot-air furnaces (which is what they were supposedly designed to test), and do a horrifically-bad job of testing boilers.

I can go into details, but for now, suffice it to say that your AFUE would go up if you left all your windows open, on the coldest day of the year.  And would go up even more if you put some fans in the windows to force that cold air into your house.  Two boilers with identical AFUE ratings can have actual fuel usage numbers that are different by a factor of two or three, easily...

Joe
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"An armed society is a polite society" - this does not mean that we are polite because we fear each other.

We are not civilized because we are armed; we are armed because we are civilized..

WendellBerry

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Re: House plans
« Reply #31 on: February 24, 2009, 09:30:38 pm »

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Those standards do <snip> a horrifically-bad job of testing boilers.

Well what was the efficiency using what test?



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MaineShark

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Re: House plans
« Reply #32 on: February 24, 2009, 09:44:31 pm »

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Those standards do <snip> a horrifically-bad job of testing boilers.
Well what was the efficiency using what test?

The actual efficiency?

The actual efficiency is energy delivered, versus fuel consumed.  A particular home might use 75 million btu's of energy in a heating season, for example.  One system might require 650 gallons of oil (containing ~ 90 million btu's of energy) to deliver that amount of energy to the house.  That would be an actual efficiency of 83%.  Another system might use 1000 gallons of oil (containing ~138.5 million btu's of energy) to heat the same house.  That would be an actual efficiency of 54%.

The AFUE numbers on those two systems might both be 87%.

Joe
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"An armed society is a polite society" - this does not mean that we are polite because we fear each other.

We are not civilized because we are armed; we are armed because we are civilized..
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