Hot Water only comes on if Heating is on?

[rthandal]

Hi Guys,

I've just bought a new property which has a gravity fed system with Worcester Bosch boiler which was fitted around 7 years ago.

I've replaced the copper cylinder for a CenterStore 210L Unvented Pressurised Cylinder but I haven't pressurised my heating, just the water only.

My plumber had issues with the wiring saying it's due to there not being a permanent live in the aeran cupboard (where the cylinder is).

Now my Hot Water only comes on if my heating is on?...but then I have to turn the thermostat right down as I don't actually want the heating on!

Any advice on this?...I also want to install a Nest or Hive but want to get this issue sorted before I get that installed.

 

[Millsy 82]

When you say gravity fed are you on about your heating is fed from tanks in the loft. Not that the boiler heats the water on gravity.

 

[rthandal]

Yeah that's right mate

 

[ShaunCorbs]

Any pics of the install ? Eg cylinder and boiler

 

[rthandal]

Haven't got any of the boiler but will get some tomorrow but here is the cylinder.

 

[rthandal]

Not a very good picture but here's the boiler

 

[ShaunCorbs]

TBH I would try and re wire it and convert to an s plan then you free up a spare core eg hot water finished which becomes your perm live now

 

[Burger]

Im newish to this side of the business. I don’t understand why there is a need for a 2 port valve for the hot water, after the 3 port valve, which is also on the same circuit as hot water. Anyone able to explain?

 

[Darren Jackson]

I do not know why you have a motorised valve on your coil feed, when there is a 3 port from the pump??? Either take it back to it's original Y plan or better still convert it to S plan. All the wires you need are there already, as you have the 3 port installed. I think you need to get a GSR in that knows how to correctly wire up heating systems.

 

[Riley]

Im newish to this side of the business. I don’t understand why there is a need for a 2 port valve for the hot water, after the 3 port valve, which is also on the same circuit as hot water. Anyone able to explain?

Safety cut off

 

[Millsy 82]

The 2 port has to be installed for the unvented. You see it quite a bit. Personally I would of converted it to an a plan but you can do it this way.

You need to double check your wiring.

 

[rthandal]

Thanks for your response guys. Am I better off getting an electrician in or a Gas safe registered plumber? I’ll get them to install the Nest at the same time.

My electrician is in the house later today so he said he would have a look for me.

House is getting ceilings skimmed and repainted etc so would rather get this work done now.

 

[ShaunCorbs]

Depends on if the spark knows how to wire heating

 

[Millsy 82]

A lot of sparks now understand heating systems as a lot are doing more and more as they are getting more and more complicated I know loads of plumbers that wont go near the wiring.

Ask them to have a look whilst their there.

 

[Harvest Fields]

A decent heating engineer is what you need.