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Posted by mike on January 10, 2006, 9:13 am
what do you mean by 60% overall? i had it tested and i was told it is
74% efficient. but now i'm confused.
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Posted by Bob on January 10, 2006, 9:30 am
You're technician told you the 'steady state efficiency'. He's talking about
'seasonal efficiency". Older boilers have more standby loss when they're not
running. You can save money by installing an automatic vent damper which
stops natural draft from sending heat up your chimney when it isn't running.
> what do you mean by 60% overall? i had it tested and i was told it is
> 74% efficient. but now i'm confused.
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Posted by on January 10, 2006, 11:36 am
Could well mean 74% while burner is lit. If duty-cycle (% of time
firing) is low, much heat that's been absorbed by innards of furnace
(making it literally glow) is sucked up the stack by convection. This
is the selling-point for automatic stack-damper.
But 99% oil-fired boiler? I'm from Missouri on that, Rans. 85% while
lit, maybe.
HTH,
J
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Posted by m Ransley on January 10, 2006, 1:55 pm
There is the afue rating, the boilers design efficiency, most old units
are 70-80% and this to measure is extremely difficult to do as gas
consumption has to be measured, among many other parameters, so people
guess by knowing the design, your tech measured burner efficiency not
overall system. There is design heat loss and time to heat to steam
figures that come into it. New boilers are smaller ,smaller boilers
heat smaller amounts of water so less fuel is waisted up the chimney. An
example is Ng tankless water heaters,[and many can be used as
boilerslike the Takagi TH1] have an efficiency of 94% but have an Energy
Factor of 92% where as the best Sears Ng HW tank has an Energy factor of
63 for Ng. Same theory for boilers, Your burner may rate tested 95% but
overall efficiency could be 50%, So you could save 50% by upgrading if
you know what you are looking for. Problem is salesman sell what they
have and know, so now you have Google.
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Posted by Edwin Pawlowski on January 10, 2006, 4:07 pm
> You boiler is probably 70-80% efficent on steady state running but
> overall 60% efficient, there are 95% efficient condensing boilers out,
> you could save 40% with a new unit, 10-25% with top line windows, and
> depending on how much insulation you can shove in 5-40%. I heat 1800sq
> ft zone 5 to -15f, last years yearly Ng was 465$, and everything is Ng.
> You have alot of room to improve but it costs to do it.
I've seen that with gas, but I've not seen any oil burners that efficient.
What brands?
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> 74% efficient. but now i'm confused.