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Thanks Stem. will do.

Thanks oilhead. STC3008 example here: https://tinyurl.com/stc-3008

The boiler thermostat for the above has failed. The thermostat is a SOFAL SL 203.01 and the thermostat probe is integral with the simple on/off switch or relay in a housing. In other words, the complete unit needs replacement. Unfortunately, given the age of the boiler, that item is no longer...

@stem. I have now installed the 3 relays as you suggested. Two of them work as is desired. In other words, when power to, for example, Zone A or Zone B vlaves is switched off, then the boiler/pump also switches off. However, for Zone C, there is a "problem". Having turned on Zone C, its valve...

@Madrab Thank you and with apologies for the delay in responding. @stem Thank you and with apologies for the delay in responding. I have not as yet been able to implement your suggestions but will report back when it is completed. I may not be able to do so for a few weeks.

In a 4 motorised valve system, how can I have the hot water valve activated not only when that valve is specifically powered but is also activated when any one or more of the other valves is activated while at the same time allowing the hot water valve to close when the hot water has reached the...

Thanks Guys. @ Exedon: Better 2 port valves than danfoss? Example please?

Hi. I have two of the above in excellent condition. However, the associated valves are not and need to be replaced. In addition, I no longer need a 3 port system and want to convert to a 2-port system. Will a relevant Danfoss 2-port valve (or equivalent) be compatible with the HSA3? In other...