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After a bit of troubleshooting I think it might just be the thermostat. The heater is 15.6 ohms which is about right for 3.5kw heater but it is open circuit on the power side of the thermostat.
I assume that's a pressurised vessel? You need to pm gasman as he might be aware of what can and cannot be tackled by yourself over there. The thermostat may well be a self servicable part.
I assume that's a pressurised vessel? You need to pm gasman as he might be aware of what can and cannot be tackled by yourself over there. The thermostat may well be a self servicable part.
Different regs from the UK no doubt.
It's called an unvented cylinder and it sounds like Bruce has found the answer.