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Is there a decent aftermarket replacement for the removable (siemens) dva2/5 actuator because the siemens ones are perennially rubbish and i forgot to replace the entire unit during the summer? I would prefer a quick resolution before i resort to freezing pipes or emptying tanks.

I have a central heating and hot water system running two CZV222 actuated valves. Unfortunately I seem to replace the de-mountable motors annually because the motor erodes the (plastic) teeth on the lever arm so that eventuallyit cannot get purchase on it. Am I missing something in the wiring...

I have a mira sport shower and have had to replace two thermal switches in the last 4 months and tonight the third appears to have gone. The underside of the switch (printed button) appears to have corroded, the second one worse than the original, but I can't see any sign of a leak on the...