>> Sounds like you have bad flow issues, blockage? so you need to resolve that first,
Yes, that’s right. Condensing boilers need the return to be at 50 degrees or lower for them to actually condense, and for most systems that’s fine with a starting temperature of 70 or so. But in a poorly insulated/draughty property, or a heating system with poor flow or that is sludged up / unbalanced there’s a temptation to just whack the temperature of the boiler up to make the radiators hotter. Then the boiler doesn’t condense. If your radiators are large enough and/or your house is insulated well you can run at a lower return temperature than 50 if you like. If you move to a heat pump based heating system my understanding is that you’ll need to address insulation and radiator size, as heat pumps output water at lower temperatures.
Last edited by: VxFan on Tue 15 Mar 22 at 20:27
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