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Posted by HeatPro on March 28, 2008 at 11:25:00:
In Reply to: Boiler Upgrade posted by Doug B on March 28, 2008 at 08:28:08:
You are misreading your boiler tag. The 86,000 is more likely equivalent to the later IBR rating, which has had 15% of the rating reduced to compensate for making sure there is enough capacity to reheat the house after service from a cold start. So the efficiency is closer to 80% which is a more ordinary oil burner rating.
The reason the cast iron system radiators give a nice even heat is that there is no time that there is no heat in the radiators. Adding zone valves to that system will cut off heat to the zones so they no longer perform as before.
A really-extended explanation of all involved would clarify the many problems you will encounter with much less a result of savings you expect. Meanwhile, an installer will be happily down the road while you discover what is meant in the explanations.
A short-cut to all this can be done by leaving all as is, but well-serviced, insulate what you can very well, install a direct-vent oil heater in the main living area, and put the rest of the money in savings.
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