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Looking at it again, I made a mistake in earlier post. Also need to move the downstairs rads return to before the cylinder return tees in. Yes, as long as all the rads returns are commoned before the cylinder return. All I can think of is the check valve not seating or fitted wrong way round...

I tried to add flow arrows to your pic but couldn't get it to copy so I could post it. But I'm sure you can work it out, the cylinder return flow splits at Tee 1, part of it going through the upstairs rads the wrong way, then through the downstairs rads the right way. The flows recombine at Tee...

So that sugar wasn't all that polar. As you say, nearly all the food you'd microwave has high water content, so in practice it makes little difference

But in the southern hemisphere (Australia, anyway) the hour goes the other way, so the time difference goes from them being 9 hours in front when we're on BST to 11 hours after we put them back.

Some years back I powered up a shed 15m from the house, using buried wire armoured cable. Double socket and a light switch in the shed, quite straightforward. Supplied from an added RCD in the utility room, taken from an existing circuit. Never been any problem. Maybe more complicated at the...

Can you do a sketch of the layout, showing relative connections? All the rad returns must be commoned before the HW cylinder return joins. It's possible the towel rail is in parallel with the HW cylinder, rather than the rads. If so the return from that should be commoned with the cylinder...

Is that so? I thought it was the water which does it, as unlike suger and fat, it has a polar molecule. But I haven't done any tests.

That's surprising, if it's true (can't believe everything said on TV!) but my microwave has no clock, just one knob for power and one for a mechanical timer. I've had several microwaves with a clock and various automatic controls and the electonics have failed after a fairly short time. Nowadays...

That's the problem. The pipework needs re-routing

Good chance whoever quoted would be trying to push him in that direction. I'm surprised the existing boiler is only 18 years old, with permanent pilot/thermocouple

The Potterton he 85 is a heat-only boiler

Just heard it on the news, went back 4 or 5 times. Beggars belief.

Apart from others' good comments, why was a 30kW boiler quoted as replacement? Most 3-bed semis need about half that. What rating is the existing boiler?

Some of these guys are programmed to say "You need a new boiler" before even looking at it. As DP says, get it serviced, or at least a second (or more) opinion.

That's what I do, and I have W-plan, which has HW priority built-in. I've never found CH having to wait till the HW is satisfied to be a problem, and I'm sure my HW cylinder coil is well scaled-up. With a modern cylinder which can take full boiler output even less of an issue.

Yes, if I asked my ex something she would yell "How the hell would I know that" or similar. I had to explain that when I asked a questiion it didn't, usually, mean I expected her her to know, much less that I thought she "ought" to know, and I didn't want to explain that every time. Eventually...

Nobody's brought it up yet, perhaps I would. It's not just jewish men either, it's muslim men as well (islam and judaism have more in common than either would like to admit), and used to be fairly common in UK with no religious connections, less so nowadays. Still done routinely in USA I...

So do you think muslim women have a free choice about wearing the burqa, undergoing FGM, etc?

Trouble is everybody thinks that

All right, give it a rest, we know which side you're on