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I noticed a dripping from a pipe on the side of the house outside, once per second. Traced it back to the tundish in my boiler cupboard. (between 1 and 6 below). Another photo: https://kuula.co/share/7P9V6?fs=1&vr=0&zoom=1&thumbs=1&chromeless=0&logo=0 Looks like I need a plumber to come...

Thanks for the info. "generally the higher this is set the more efficient the system will be" Should I not just set it to 100%, to get the best efficiency? Also: Do you think it's worth me lagging the hot exposed pipes in the picture?

OK, I've done some more reading now. Are the below statements correct? a) Electrical immersion heater in Megaflo should be turned off. It's just for high-hot-water-demand emergencies, e.g. showers when guests visiting. Gas boiler is cheaper for heating water so should be used day-to-day...

I don't know the first thing about plumbing! I've taken a photo of the system in my house and labeled it up: http://www.asktoby.com/miscimages/plumbing.jpg 1: Honeywell thermostat, adjustable. 2: Heatrae Sadia Megaflo Thermostat 3: Thermal cutout 4: Honeywell motorised valve 5...