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I’m looking to add a Nest stat and have been looking at how the current system is wired. I have a Honeywell stat that sends to the boiler. The boiler is in the garage and the programmer and tank are in the bathroom above the garage. The junction box by the boiler has mains power, going to the...

The outside temp is approx 10 degrees, but the house is a little cold at 16 degrees, so I thought I'd put the heating on for a bit, but the boiler is only show 38 degrees and the only way I can get the rads to get hot is to put it in chimney sweep mode. The boiler is coming up to a year old and...