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Is there’s any risk for running boiler at that low a temperature?
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Yeah, if you have a storage tank you have to keep it hotter to prevent legionnaire’s disease. The bug doesn’t survive above 60, I would set the outflow a degree or two higher to be sure. But if you have a combi boiler with on-demand hot water you can do 50. But IAMAP etc.
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As people have said, if it’s a combi with no cylinder or storage tank then no, it’s all upsides. Combis are often set far too high, to the point they’re not even condensing to recover the heat from exhaust gases, they’re much more efficient at lower temps. If you can get away with running the heating circuit at 45 then even better.
Even with a tank the risk of legionella for youngish healthy people is very low. A fortnightly half an hour at 60 degrees is probably all that’s needed.
*all info gleaned from HeatGeeks
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mr_tom
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@edscoble
We been lowering our boiler water temperature to 45 degrees (from 60), and notice no difference beside it taken maybe 10-15 second longer to get hot water.
Is there’s any risk for running boiler at that low a temperature?