My Dad has an oil-fired boiler with a domestic hot water heating coil in it. The coil needs to be cleaned. I sweated on a couple of isolation valves and the fittings to couple up two short garden hoses and a pump so I can pump a solution through the coil. The last time I did it I think I used CLR or similar product. My question is, is there a better type of coil cleaner I can pump through there? Thanks fellas.
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Cleaning Domestic Hot Water Coil