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  1. M

    Which bits of Honeywell heating controls are 24v?

    Spot on poni s. I got confirmation from an excellent Honeywell UK helpline on 0300 130 1299. They also confirmed that the new valves would work fine with my ancient ST7100. I drained the system down yesterday and fitted the valves. Everything tickety boo today! Now it's onward to Amazon to...
  2. M

    Which bits of Honeywell heating controls are 24v?

    Hi, I'm super-confused. My new ST9400C controller, V4043H zone valves and T6360B1028 room thermostat were all purchased as 24v items (eg see https://www.amazon.co.uk/gp/product/B003CSGRIQ/ref=ppx_yo_dt_b_asin_title_o04_s00?ie=UTF8&psc=1). But now that I've got the wiring diagrams it seems they...
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