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How is it poor? I'm saying you can shut off each radiator one by one with the valve. Then I say vent each radiator?

I'm a commercial gas engineer

Understood mate. But when she has 2 rads not working at all. Biting the bullet now and trying to sort it themselves is worth risking.

So explain to me how the op should remove a potential airlock on a heating drop with the bypass open?

The white handle is the valve you can turn to shut off the radiator. So ideally shut each valve with the radiators that are working fine.Vent each radiator one by one. close the brass valve near the cylinder that has no handle. ( but when finished this valve will require adjusting back to where...

Do you have thermostatic radiator valves on any of your radiators? And a vent key to vent the radiators?

Sorry but the water coming from tap is from the domestic hw system the reason it's not warm is because water is not circulating around the internal cylinder coil and the radiators. The system worked ok before then I doubt balancing will be required. The air will be in the primary system.

Do you see the brass fitting on the vertical pipe without an handle. Can you get some pliers and with the pump running turn it fully clockwise?

On the programmer not the tap

Have you tried just running the hw by itself?

Where in the uk are you? £90 an hour 3 hours is a lot of money. And he should of left it working correctly. And if not a fault diagnosis. Nathan

Jesus Christ. That is shocking, I honestly don't know how you let them leave the house. Nath

I can give you a number for an engineer gassafe and holds G3 Nath

You need the correct flue. Sure the flue is obsolete tho. I might be wrong. Nath

No not diyable as the outer case seals the combustion chamber. Nath

The problem with doing that is inspection hatches. Also a point to rod. Will the extension be full width. Nath

any pictures of drawings etc? It's kinda difficult to see what your working with. Ive seen the soil pipe over the roof on a few houses. I'll be honest apart from looking like a c••t, I don't see why it wouldn't pass. Nathan

Looks like the stopcock is the facing the wrong way. Is it a lead pipe? Have you got the same problem with your other taps. And last have you called your supplier? Nath

All depends on how fast it fills. In theory if your removing 1 l/s and the tank is been filled at 1 l/s then a one litre header thank would be enough. But if you have 9 l/s coming in and your draw off is 12 l/s then that's net 3 l/s of storage. so if you had a 10 min shower it would be...

Upload a picture not upload the stat.