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[Tony H]

Evenin' all, can anyone tell me if it is o.k. to run the pump on a gas boiler of the upstairs lighting circuit? The reason I ask is my daughter has just had a boiler fitted in the loft and the installers have tapped into the lighting circuit to feed the pump, I would have thought that this wouldn't be "best practice" but I could be wrong.
TIA
Tony

[Marie]

I couldnt tell you personally but my dad is a plumberand heating engineer, cant call him tonight as its now a bit late but i can tomorrow for you if youd like

[jonny2112]

Lighting circuits are lighter than normal mains, and whilst I have no real knowledge, I would have thought it should have been off the mains 
Lighting is 1.5mm whilst the mains is heavier at 2.5mm.
I guess it will depend on the boiler requirements.

[TheBoy]

I thought all parts of the central heating should be off a dedicated circuit 

[Tony H]

I couldnt tell you personally but my dad is a plumberand heating engineer, cant call him tonight as its now a bit late but i can tomorrow for you if youd like

Thanks for that Marie I would appreciate it  .

[jonny2112]

I thought all parts of the central heating should be off a dedicated circuit 

Yes, I would have thought a boiler should definitely have its own circuit.

[Marie]

I couldnt tell you personally but my dad is a plumberand heating engineer, cant call him tonight as its now a bit late but i can tomorrow for you if youd like

Thanks for that Marie I would appreciate it  .

noworries Tony could you post the make and model of the boiler for me and the pump if you can get it and ill ring dad at lunch tomorrow andlet you know.

[Martian]

No it's not alright.

A switched FCU should be fed using a minimum 2.5mm˛ cable as it is capable of being fitted with a 13A fuse.
The feed to the boiler should have been taken from an RCD protected ring main, or from it's own dedicated MCB/RCBO in the CU.
The person fitting it also needs to be Part P certified.

[Andy B]

....
The person fitting it also needs to be Part P certified.

hence self contained boilers having a plug on them ........ therefore no need for the cert. 

[Kevin Wood]

.. and the pump should, more often than not, be fed from the boiler as a lot of modern boilers have a pump overrun feature that keeps the pump running until the boiler has cooled off after firing.

[Martian]

....
The person fitting it also needs to be Part P certified.

hence self contained boilers having a plug on them ........ therefore no need for the cert. 

Still need to sign off when you fit either the socket or FCU that is supplying it though (if it's not there already as in the OP's case) 

[Andy B]

....
The person fitting it also needs to be Part P certified.

hence self contained boilers having a plug on them ........ therefore no need for the cert. 

Still need to sign off when you fit either the socket or FCU that is supplying it though (if it's not there already as in the OP's case) 

Which goes to show that there must be loads of houses that wouldn't pass muster ........ 

[Rods2]

Yeeh har! What was the companies name Tonto and the Lone Ranger Plumbers Ltd. 1, Cowboy Trail, Texas

Are they Gas registered and do they have part P. I suspect not for the latter, what about the former? No it is a big no, no, to take the boiler or pump feed off a lighting circuit.

Sounds like they have cut more corners than The Sweeney in a high speed car chase. 

Yeeh har!

[tigers_gonads]

As Martian says 

Your boiler should be run from a seperate circuit on your consumer unit.
If its just a standard domestic combi boiler, you can run the cable in 1.5mm T&E with a 6 amp breaker at the consumer unit end and a 3 amp fuse fitted into the switched fuse spur.
The circuit must be rcd protected.

It "should" be signed off by a part p sparky 

[Elite Pete]

I take it your daughter doesn't live in Liverpool then Tony or the boiler would have been wired into next doors