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Replacement boiler for forced hot water baseboard heating system

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paperfist said:
Right, but like I said my boiler is already heating my water to keep my house warm so I’m not using 2 systems to accomplish the same thing as you are.
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I'd agree. The more evenly you can load up the boiler and avoid the cool downs between cycles, the better in the long term for the boiler and for efficiency.
paperfist said:
My Buderus is pretty close to perfectly insulated. 1” thick foam 360 degrees around the tank. Even the penetrations are insulated.
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Nice, those Germans think of everything
 
finally got my quotes. 12k for the 90+ boiler and 7500 for the 83%. i bet it would take me 25 to 30 years to make up that much difference. the old one is a 60% so i will be gaining a lot anyway. i should save 15 % or more on the 83% already. so im down to less than a grand per year in gas. another 5 to 7 % is less than 100 per year savings. thats even assuming the 90+ would run at high efficiency much more than it actually would with our system.
 
herm0016 said:
finally got my quotes. 12k for the 90+ boiler and 7500 for the 83%. i bet it would take me 25 to 30 years to make up that much difference.
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For those calculations, is that for natural gas?
I saw similar figures when planning my boiler purchase and stayed away from a 90+ efficiency condensing boiler, we also have NG. IMO, the only place where it would make sense to purchase such a boiler is if natural gas were not available and I was going to use propane; way more expensive than natural gas. At current NG prices, IMO I just cant see what kind of scenario would support such a purchase. The technology is cool and the fact that such a high percentage of the heating value of the fuel can be extracted (up to 97% I've seen) is quite the accomplishment; unfortunately it makes little economic sense at the moment for me.
 
Yes. For ng. It makes sense for a new system designed for a condensing boiler, not for an old system not designed for the lower water temp.
 
rebate is like 300 bucks. whoopty do. and we are on city utilities for everything but gas, which further limits the rebate potential.
 
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