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Hi, I have done some copper pipework for the flow and returns runs for my central heating system. The overhead runs are 22mm and I drop-down in 10mm microbore to each of 5 radiators. The 22mm run is about 20m long and the first 10mm connection is about 15m along. First I air pressure tested...

Hi, I have a bungalow that uses trusses that have a 6m span which are spaced apart by 0.6m for a total length of about 12m (about 20 trusses). Each truss uses 4 webs/posts in a 'w' formation. Forgive me if this is not the correct terminology. The trusses are made from 72mm x 36mm timber. The...

Hi DIYnot, I have a bungalow that is out in the sticks which is connected using TNC-S. The cable feed is a combination of overhead and underground and must be about 300-400m from the tranformer in a garden nearby. I considered the case of a loss of the incoming combined TN which could result...

Hi, I have a new Grant Combi heating system in my bungalow. The 28mm flow and return pipework enter the loft region and splits into two 22mm heating circuits one for each half of the bungalow. The 22mm pipework is insulated and sits directionly onto the joists and where a radiator is needed I...

Hi, I have just had an oil heating system fitted which is a 36KW Grant Vortex Blue Combi with built in 25L expansion tank. I am trying to work out if I need an additional expansion tank (I have an additional 25L BOSS vessel that I could use if necessary). I have quite a large bungalow and have...

Hi, I have recently had a Grant Vortex Blue 36KW boiler internal fitted and it seems to work OK but I have noticed that when the cold water is switched on, say in the bathroom, the boiler starts up like it is heating up the internal hot water store. It doesn't do it every time, but after it has...

Hi, Have just moved into a new house and have a Burley G4220 flueless gas heater in the main living room area. Recently purchased a new bottle of propane gas which was connected alonside an existing bottle which was about one quarter full. The pilot light operates as expected after a number of...

Hi, I have taken the wax module part off of the diverter valve and it appears to be faulty. Although the central pin does operate it is weak and leaks what appears to be wax. Can this component still be obtained without having to replace the entire valve assembly? If so where? Regards...

Hi, Although the hot water works fine I have a strange problem with the CH which has gradually got worse. I have tried several attempts at fixing this problem and yesterday even replaced the pump which has not corrected the problem. I realised after some thought about the matter that...

Hi, I have recently had some problems with this combi and have changed the CH pump. It operates fine and I can hear the water going through. The system was completely emptied and refilled. I have noticed that whenever it has been emtied it takes ages beore the hot water starts to circulate...

I have a Potterton Puma 80 combi which for some time now has not been heating the 8 radiators properly in the house. It takes hours for some radiators to warm up and I have noticed that the return pipe to the boiler (22mm) never gets all that hot. I have recently balanced the radiators but...

Hi, We have Potterton Puma 80 combi and for as long as I can remember if the central heating is on and the hot water is switched on too quite oftem the gas will go out along with the pilot light. The only way to get the boiler back on is to go through the procedure of starting the pilot...

Hi, We have a Potterton Puma 80 combi which came with the house so I am not sure how old it is. The problem is that it takes ages for the radiators to warm up especially those at the end of the run. Just lately it appears to be getting worse. When the central heating is switched on...