Radiator comes on with hot water

[the primary]

Hello all,

I've just had a new radiator installed and it comes on with the heating as expected but then also came on when the hot water came on without the heating.

Ours is a system boiler worcester greenstar 30cdi with an unvented cylinder. The new radiator has been hung in the w/c on the wall that backs directly onto the boiler in the garage. I have attached pictures of how it has been attached the the system.

Can anyone explain why it is coming on with the hot water and have the engineers cocked up the installation?

Thanks

 

[Deleted member 294929]

Need a bigger picture of pipework

 

[Deleted member 267285]

I can’t see a picture, but from what you’re describing they have tee’d into the f&r - return after the cylinder, so it will do what you’re describing. Get them back to do it properly

 

[oldbutnotdead]

Wonder if they've been lazy and bad and used that rad instead of fitting a bypass (assuming that boiler needs one?) . Does the rad have a TRV on?

 

[the primary]

Yeah, I think going directly into the flow and return is what they have done. I think they've done it because there isn't another radiator close by and the boiler is literally 6 inches behind it. It does have a TRV on it.

Hopefully it won't cause any big issues. They're normally a solid company and actually installed the system boiler 6 years ago, coming back every year to service.

Thanks for the responses so quickly.

 

[oldbutnotdead]

The only issue (might be a bonus tbh) is that the downstairs loo will be heated whenever any other part of the system calls for heat. Which will have a cost to it- if that room is well insulated and the trv is working then it might be insignificant.
If you can be bothered, take a daily reading of the gas meter- day 1 as is, day 2 with that trv switched off.
The alternatives were probably a couple of long awkward surface pipe runs or add a motorised valve or add a smart trv- any of which would have added a hundred quid to the job.

 

[Deleted member 294929]

All looks a bit crap to me. Harleyva solid company. Could have used copper rather than push fit. Would have made insulating the pipes easier if they had bothered.