Recent content by adh2020

I don't think there is a motorized (zone?) valve in the system. The pump is inline on the CH circuit. The DHW is gravity heated up to a chlorifier hws storage cylinder in the loft. The boiler & controls are first floor level.

Hello, I just got round to replacing the mechanical timeclock in my house, it had a pretty loud and annoying ticking characteristic. It was a Horstmann 423 diamond 2 on/off settings (same every day), and same for dhw and ch. We had no thermostat in our house either, the dhw is gravity with...