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Sorry AquaheatI, i really did not imagine that anyone could possibly find my conversational approach offensive. Thank you for your help. Tony

I'm not keen on that because the radiator is a 3m long single, so it needs quite a large flow to do its job.

It's a bidirectional valve at the hot end.

The rad has a mechanical TRV. The room has a wood burning stove that is used occasionaly and so the TRV sometimes needs to shut off completely. The problem is that as the valve reaches the "almost completely closed" stage the flow through the valve is particularly noisy and it stays in that...

I have a radiator which is noisy when the TRV is in the partially closed state. Do electronic TRVs switch directly from open to completely closed or do they have a partially closed state? Thanks Tony

Bernard - you have grasped my point - ignore the noise! ;) Methane + Oxygen -> Water Vapour + Carbon Dioxide If all the Water Vapour condenses in the boiler, then the boiler is working as efficiently as it can. (Presumably the manufacturer quoted efficiency). As you say, manufacturers may...

Anyway, back to the question, which was: Is there an established way of calculating the real world efficiency of a condensing boiler by measuring the condensate output and the gas input?

Please correct me if I'm wrong, but it would appear that the more efficiently the boiler is working, the more condensate will be produced per unit of gas. Is there an established way of calculating the real world efficiency of a condensing boiler by measuring the condensate output and the gas...

The base is on made up ground so is to some extent behaving as a raft.

I am going to put down a 3m x 3m x 0.1m slab as a base for a garden shed. The shed will be mostly wood so not much load. I've got some wire stock fencing rather like this: I was thinking of using it to reinforce the concrete. Will this work or could it even weaken the slab. And before...

I have a retaining wall to which I want to bolt fence posts. The fence posts are 100mm square. I can't find any projecting expansion bolts long enough to fix the posts. Any ideas? Thanks Tony

Is anyone fitting pressure vessels on the cold supply when they fit combis, or is this just a British Gas thing?

A nice man from British Gas serviced my combi-boiler the other day and told me I needed a pressure vessel fitting on the water supply to my house. He explained that when I turn off the hot tap, the hot boiler would cause the water to expand and thus increase the pressure in the cold water...

Sorry, the diagram shows the existing downstairs toilet. The upper frame shows the sewer pipe exiting horizontally and turning 90 degrees into the floor. The lower frame is the same downstairs toilet showing the hypothetical connection to the upstairs en-suite.

Unfortunately I can't upload a photo because it's my dads and is some 300 miles away. However, this sketch should clear up the uncertainties.

Thanks, that really helpful. Back to my initial question:- Downstairs toilet below new en-suite. Downstairs wc exits horizontally into elbow then into floor. Is there a connector available that can replace the existing elbow allowing an additional side access for connecting the upstairs wc...