Hive - Should I need to do HW & CH, or should CH do nothing??

[diditrain]

One of the lives into the hive receiver backplate will be permanent from your fused connection unit, the other two will be going out to other parts of your system. One of them to a wiring centre at a guess and the other who knows without seeing it.
Terminal 3 from your backplate will be the switched live from the receiver for hot water on and terminal 4 will be heating on switched live from the receiver.

 

[ferg]

I'm having a bit of trouble interpreting your post.

You should have to call for HW separately from CH.

 

[Chris M]

I'm having a bit of trouble interpreting your post.

You should have to call for HW separately from CH.

Really? Perhaps I've been lucky but I've never had to do this prior to this property, and feels very inefficient. (I've never had a combi, always stored water).

Are you saying it's normal to have to always separately schedule my hot water just in case the temperature drops such that a demand on heating is required? Surely I'm heating water for no purpose?

Just to be clear, if I don't schedule hot water and ge heating comes on it just pumps cold water around.

 

[Chris M]

And just add more weirdness which might help...

If I have a full tank of hot water that could do a bath, if I turn the heating on the radiators go immediately hot and use all the hot water which means no bath for 15 minutes till the system has heated more!

 

[davesparks]

It sounds like it's wired up as a gravity system, hot water fires the boiler and heating operates a pump.

I'd say you'll need a decent plumber and electrician to work out what bodgery has been done and how to fix it.

 

[Chris M]

It sounds like it's wired up as a gravity system, hot water fires the boiler and heating operates a pump.

I'd say you'll need a decent plumber and electrician to work out what bodgery has been done and how to fix it.

Booooo feared that might be the case..

In any particular order or find two guys and get them both to rock up at the same time?

Would pics on the wiring near the cylinder help at all or too much to remotely diagnose?

 

[diditrain]

No harm in posting some more pics, but yeah, you really need someone out to make a professional diagnosis.

 

[Leesparkykent]

What you have there is a thermal store. One pump operates the flow from the boiler and the other pump is for the heating. A thermal store like you have should ideally maintain its temperature 24/7. It works opposite to the way you think it would as the water in the cylinder heats the coil that the water passes through so you have mains pressure hot water.

 

[Leesparkykent]

The hot water function on the timer/hive isn't actually timing the hot water its timing the boiler to heat the thermal store.