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Posted by HeatPro on March 02, 2007 at 12:07:21:
In Reply to: old Raypack boiler posted by bdub on March 02, 2007 at 09:08:43:
Raypack has been known to heat domestic water with the heating system; but I have some doubts that has been applied to a slab system. you can answer which is fact.
If you use a boiler for domestic water, then scale is a usual result of having the calcium and magnesium in water harden on the inside of tubing, blocking passage.
As boilers are more often used in SEALED systems at 15 to 20 psig pressures, no scale enters to do that unless there is a serious leak being made up all the time. Thus scaling doesn't happen in 'normal' slab heat systems.
So there is some confusion here from inadequate information as to the cause of the problem.
It is possible the gas regulator has lost some pressure, derating the boiler as a cause and a proper service would restore it. IOW, buying the premise before knowing what is the cause is just guessing in the wind. Replacing a boiler because it needs descaling so the new boiler can scale up again from improper care is a waste of money.