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Doesn't sound like you'll find anyone clever enough to match your demands. Best of luck.

I always wanted a TVR.

Qual-oil is discontinued I think.

Kind of like bump starting your car to get to the garage, to have new tyres fitted, and then expecting them to fit a new starter motor because the car was running when you got there?

...

You could use an even cheaper set up and run one boiler 10°c less than the other. Change temp at every service.

If you buy a ball of string from the pound shop, unwind it all and then measure it, you might get an answer.

Everyone loves a 'while you're here'. :mrgreen:

Has the vessel been changed? Had them in the past where the bag inside rubs against the metal casing making similar noises.

I reckon they're experts by now. 2009, 2014, 2019 and already booked in for March 2024.

A little bit of paste on compression fittings gives you a little bit of back up. Nut and olive on, small smear of paste round, crank them up, move on.

As above. Doesn't matter what combination you go for, if you've only got 12 litres per minute incoming, could get quite disappointing.

If no wall, mount on a piece of ply and make all the connections. Saves pulling stuff apart too many times. We've had a few issues with early pipe degrading and leaking, air vents weep, flow meters that need replacing but I've never seen a pin holed manifold. But, can't say I never will...

The usual method is to mount the manifold, lay the underfloor heating pipe and connect to the manifold. Flush and fill the loops and leave on test while the floor is screeded. If you've laid the pipe, just buy a manifold from an UFH retailer and hope your pipework is OK. We've fitted hundreds...

Out of interest desktop987456, Are there registered gas engineers in Pakistan? And a building regulations system?

Look at expansion vessels.

The old saying used to be.... 4 inch drain but a 6 inch ar5ehole. Don't know if that's helpful but you could add it to a list of possibles?

He might not be answering because he doesn't want it or priced too cheap.

Ripples are more to do with the way it's bent rather than the copper.

You can get 2m lengths from screwfix if that's any easier for you.