Hi, I’m removing my old gravity fed hot water tank and 12kW heat only oil burner and was going to replace with a combi as I have very little internal space. My OFTEC installer wants to fit a 21kW or even 26kW grant vortex pro combi (suggesting 26kW for better DHW). My heating system is about 8kW of rads. I spoke to Grant and they are suggesting this is massively oversized. You can’t really get significantly a smaller combi than 21kW. Is this a bad idea? I’m concerned about excessive short cycling. The heating volume is about 130l plus the boiler which might help buffer the heat. Or is unvented plus heat only my only real option?
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Oversized oil combi
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View the thread, titled "Oversized oil combi" which is posted in Oil and Solid Fuel Forum on UK Plumbers Forums.
Worcester heatslave 12/18 will give you around 12-14 lpm which is good enough for most
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Reply to the thread, titled "Oversized oil combi" which is posted in Oil and Solid Fuel Forum on Plumbers Forums.
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