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Re: Which is better: Munchkin 140 vs. Weil-McLain Ultra 155


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Posted by HeatPro on June 19, 2006 at 18:22:52:

In Reply to: Which is better: Munchkin 140 vs. Weil-McLain Ultra 155 posted by Eichler on June 19, 2006 at 17:48:15:

Neither boiler has anything to do with the intended result - that is, getting the slabs to heat up faster. You could get an industrial boiler the size of the house that is capable of heating the entire block and attach it to the slab and it won't heat up tons of concrete through little tubes with 140 to 180f water any faster. The heatup time is limited to the amount of heat the tubes can carry, the tubes that are in the floor and the amount of slab weight to heat. The proper sizing of the boiler and pump is already done and finished, as it successfully heats the house while you are patient enough.

If you want to heat up the house faster, put a hot water coil in the AC ductwork to bring the air temp up while the slab takes its time.

In fact, I prefer to keep the slab temperature fairly constant throughout once it gets below 50F out and let a duct coil bring the house up and down on thermostat reset.

The newer boilers can get you some more gas savings over time; but not enough to pay off some 4-5000 dollars in a few years reducing your bill 10% a year.




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