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Despite cavity wall insulation filled my walls are socking cold as if no insulation in between also have insulated my suspended floors but still my floors and walls are too cold and quite damaging in terms of heating bills. Please any expert tell me what if I do the external wall insulation is...

I've a system boiler with Hive smart control and pressurize cylinder and I control the hotwater through app schedule to reduce bill. Please can someone help me is there a way if cylinder is already full hot water won't come on as per schedule? as I noticed schedule always run the boiler no...