central heating question (room thermostat)

[David87M3]

Hi,
A friend is getting a new boiler fitted by a "friend" of her partner's. At a cost of £1700 cash.
Im not to happy about this but never the less its going in. Apparently he is corgi regestered and works for the council

I dont think a room thermostat is being fitted and instead there just fitting thermostat valves to the radiators. Is this allowed? I would have thought this would result in the system running all the time when programmed to do so by the timer?

I rented for a few months whilst waiting for my new house to be built and the rented house had the same kind of system. I was for ever having to get the gas meter card topped up.

[andy43]

A plumber will know for sure, but I think you do need a boiler interlock ie a stat.

[bimsb6]

we only have thermostatic valves on the rads with no room stat .so yes it is ok .

[Deva Link]

David87M3 said:

Im not to happy about this

Why?

[andy43]

Just looked this up - under Part L of Building Regs...
• Boiler Control Interlock:
The boiler and pump must be wired such that
when there is no call for heat from either the
space heating or hot water circuits then the
boiler and pump4 are switched off.This is
achieved by the correct installation of the room
thermostat(s) or programmable room
thermostat(s), hot water cylinder thermostat
and zone valve(s) as appropriate.The use of
TRVs alone does not meet this requirement.

[David87M3]

Deva Link said:

David87M3 said:

Im not to happy about this

Why?

becasue there will be no comeback if anything go's wrong. and also when she sells the house there will be no proof of a professional install.
Its a cash job

[Ferg]

Yeah, spot on, it doesn't meet Part 'L' and therefore fails building regs. It's also more expensive to run and (if I might be so bold) is the sure sign of a cowboy plumber.

[David87M3]

andy43 said:

Just looked this up - under Part L of Building Regs...
• Boiler Control Interlock:
The boiler and pump must be wired such that
when there is no call for heat from either the
space heating or hot water circuits then the
boiler and pump4 are switched off.This is
achieved by the correct installation of the room
thermostat(s) or programmable room
thermostat(s), hot water cylinder thermostat
and zone valve(s) as appropriate.The use of
TRVs alone does not meet this requirement.

Thank you

Dave

[David87M3]

cheers gents. I will see whats fitted and maybe have some fun

[Ferg]

While you're at it Dave, bear in mind that the 'Benchmark' certificate must be filled out for Building Regs and the installation should be 'Notified'.

In addition installers can be checked these days online at the Gas Safe Register....

[headcase]

Also you cant fit ALL TRV's you need to have 1 rad not controlled by a TRV (usually in the room as the thermostst), the reason being you can get into a situation where all rads switch off (when they reach temp)and the pump is still running (due to no thermostat turning it off)