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Look at Honeywell Evohome or Tado smart TRV heads
The spindle that is leaking, can be changed or o rings replaced. ( done that )
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My thought too
Second is more thorough but first is offering a better boiler ( my choice). Then again WB technical backup is hard to...
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John the hair splitting is a system boiler is still a heat only boiler be it it has a pump and EV fitted within