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0answers
10 views

What are the consequences of incorrect positioning of air separator (and swapped return/flow) in solar heating system?

I've moved into a house that has a Vaillant Solar system for helping heat the water. We had various issues that resulted in a Vaillant engineer visiting, who pointed out various problems, including a ...
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1answer
423 views

How can I install a nest thermostat with no wires?

I have zoned heating/AC/heat pump. My original thermostat on the wall is NOT connected to any wires, in other words it is wireless. I thought it had wires so bought the new Nest thermostat. ...
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1answer
2k views

Potterton EP3000 -> Horstmann C27 boiler programmer wiring

I'm in the UK, using an ancient tempermental Potterton EP3000 boiler programmer, but I have a brand new Horstmann C27 which I'd like to replace it with. Apart from the mains supply, there are three ...