HI WILL A SEIMENS 3 PORT 22 MM VALVE DA-V322 BE OK TO REPLACE MY HONEYWELL V4073 PLEASE IF IT IS COOL IF NOT BOO HOO WHY NOT THANKS ANSWERS WOULD REALLY HELP
Don't use a Horstmann. When you put this valve in manual position is closes the end switch and always fires the boiler. Same on a Sauter Valve. Stick with the Honeywell.
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