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Should maybe add that I was so impressed with the boiler I have installed one at home which you wouldbe welwelcome to see if you wanted.

We are P5 installers basef in Manchester more than happy to discuss your requirements with you. If you PM me your number I will give you a call to discuss over the weekend.

there is a bleed on the oil pump pressure test point, but be careful if you don't know what you are doing and "undo" the wrong connection you could adjust the pump pressure and need a tech anyway

With those floor coverings and such a thin screed I would not set back at all, there is very little thermal mass to hold the heat and what there is will be restricted by the insulative wood and carpet.

With a GSHP it is important not to allow air temps to drop too far, because depending on the unit and design of the system, if it has to work too hard to recover it may recruit an onboard immersion to achieve the new set points. We don't advocate more than a 2 degree air temp set back for a...

Could be a minor leak on the oil line if it is sub-gravity, but need more detail like oil supply design, top exit/bottom exit tank, distance/height relative to the burner/tiger loop fitted etc.

If its a combi it could be a plate pre-heat to speed up hot water response times which can usually be turned off.

It would be worth checking the output of the boiler and its range rating (via the size of the nozzle) to the demand you have. You also need to ensure that the pump is sized and set up to move the heat around the system. Oil boilers don't modulate so it may be that at this time of the year with...

Have they fitted new TRV's by any chance and do you have a pipe running beneath each rad with the valves connected into it at each end of the rad, or does the pipework go into 1 rad valve and out of the other? Like picasso says it could be pump speed, depending on the layout heat needs to fill...

Ben have you checked that there are no isolation valves on the flow, to and from the valve and the return connection, you have got the pump isolation valve (but wouldn't trust it). If you can post additional pictures or draw up a schematic there may be an easier option.

Not to confuse matters but have you seen Firebirds latest oil boiler, not thr blu flame option but the one with what is in effect an anti cycle device to cut the flame during thr demand sequence to control short cycling at lower loads. We haven't fitted one yet but will have a better look at...