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robin_tern t1_j25xhpb wrote

Reply to comment by Blecher_onthe_Hudson in Did your heating fail to keep your temp up last weekend when it was below 10 deg? by Blecher_onthe_Hudson

So you can't increase the boiler temperature without risking scalding your tenants? I imagine there would be a way to increase the heating water temperature separate to the house hot water, even on a combined system.

My house was struggling to get to 65 with the boiler set to the default 180 degrees, I increased to 210 and things got much better.

Robin.

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Blecher_onthe_Hudson OP t1_j260yu9 wrote

The tank cannot be increased beyond where it is set. The water heater has a mixing valve for the domestic hot water so the tank temperature is irrelevant to it. If your water heater doesn't have a mixing valve it should, not only does it create effectively more hot water from your tank, but your tank should be set to at least 130 to eliminate the possibility of legionella breeding in your system.

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