Thanks for your advice and info Witespirit66. I will fit wheelhead valves to a couple of the rads and see how it goes - a lot less grief than converting to a two pipe system. If removing the TRV's doesn't solve my problem, then I suppose I shall just have to face the two pipe installation.
with the boiler set to max, it shuts down at 80C and the pipes all round the house are too hot to touch. The bathroom is the first rad and gets very hot quickly. The rest take a lot longer and never get anything like too hot to touch.
radiators are bottom fed. Is this OK on single pipe...
How many people live there, and how many bathrooms? Do you use lots of hot water?
normally, two adults one bathroom No we dont use lots of hot water. Bungalow is about 11M x 9M footprint
My plumber has just replaced a failing Baxi bermuda back boiler with a new Vaillant eco 37 combi. The system now takes a painfully long time to heat the 7 radiators in my small bungalow (Hours). The pipes get hot quickly. He has put 'normal' TRVs on 6 radiators and one without a TRV. Vaillant...