heating a hot tub using my domestic coil

heating a hot tub using my domestic coil

PostBy: kevinjohn On: Fri Jan 24, 2014 3:17 pm

I have a efm 350 coal boiler and do not use the domestic coil for hot water,I have a indirect water heater because I also have a oil fired boiler and wanted the ability to heat domestic water with both sources,that said,is it a good idea to use the domestic coil in the coal stoker to heat a hot tub or should I go with a heat exchanger and separate zone off the entire heating system.really my question is ,will I damage the coil with the chemicals used in the hot tub,bromine is what is used to keep the water sanitized and clean.thanks in advance for any and all feedback
Stoker Coal Boiler: 1963 efm 350 coal stoker
Coal Size/Type: buck
Stove/Furnace Make: efm
Stove/Furnace Model: 350 w/auto stoker

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Re: heating a hot tub using my domestic coil

PostBy: Carbon12 On: Fri Jan 24, 2014 3:25 pm

Separate zone with heat exchanger. The hot tub chemicals will rot the coil out in no time. Plus, the coil is only 1/2 inch. Bigger is better in this case.
Stoker Coal Boiler: Keystoker KA-6
Coal Size/Type: Rice/Anthracite
Other Heating: Heat Pump/Forced Hot Air Oil Furnace