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Question DetailsAsked on 10/11/2015

I'm converting from oil to gas heat what's the best boiler the conventional or the combi boilers

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1 Answer


Different people, different opinions, Combination high-temp storage tank should save some money in the long run - over say 10-20 years or so. Some people like them because it eliminates replacing the water heater every 10-15 years, though for the amount they cost you could get a 20-30 year stainless water heater cheaper.

Personally, I like separate boiler/hot water heater because in a boiler or power (hence circulating pump and probably firing also) failure in extreme cold weather, if you are careful not to overpressure the boiler, you can bleed hot water from the hot water heater through the baseboard heating loops to keep them from freezing and take the edge off the cold.

One thing that is bad about combining the systems in an existing house is the baseboard infloor heating loops (and boiler) tend to go pretty stagnant and meatallic (or plastic) tasting over time, so you tend to get that smell and taste in the domestic hot water if you circulate both domestic and heating water together through the boiler. If not intermixed, then that adds a heat exchanger to your system, so one more thing to fail.

They are somewhat more complex, with several more valves and controllers and pressure regulators compared to the simple boiler.

Answered 4 years ago by LCD

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