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Thanks all for your help. The ESRTP4+ was N/O + COM wired only (not OpenTherm) so I went for a Nest E. Did look at the Tado option as we...
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Your boiler supports Opentherm so hopefully the existing thermostat is connected correctly but there's a good chance that the original...
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Thank you for your prompt response CBW. I am not at the property until Thursday. Will check the actual wall mounted thermostat for...
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It depends on how it’s connected could be opentherm or could be mains/extra low voltage. Opening the cover on your boiler should be...
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I have a Morco Series III GB24 combi boiler connected to a ESI ESRTP4+ thermostat. What I would like is a thermostat that I can access...