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Whats the difference between the WB2B and the WB2C. Cheers.

Would like to use my old wireless thermostat on my new Viessmann 200W boiler until I sort out weather compensation. Pics below show the wireless thermostat connections on the left and on the right the Viessmann boiler connections. Any help greatly appreciated.

The two wire programmable thermostat has packed in on my Wickes Combi 2000 combi. I've purchased a Celect COR908WHB-3-RF/B Wireless thermostat off ebay but I'm unsure which way to wire it up. I've uploaded the diagrams for the combi and the thermostat so any advice would be greatly appreciated.

The pressure drop is on the heating side only when the heating is on. As the heating is currently off I've currently filled the system to max, just under 3bar and its holding steady - no pressure drop at all. I'm pressuming the pressure vessel has past its best or is it possible to...

Just purchased a Evergreen ST0311 multi fuel stove secondhand. Flue diameter on the stove is 127mm. I've fitted the stove to my exsisting fireplace which used to have a gas fire fitted sometime ago, the chimney is lined with a 7 inch flexible liner. In the past the smoke test done by the gas...