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If that is indeed the mains cold water supply to the tank it shouldn’t have a gate valve on it, there should be either a stopcock or 1/4 turn valve

Best not to mix components, they are designed to work as a “system“

To completely drain the system you would need to drain at the lowest point / points without knowing how your system is piped it’s difficult to say.

Saying it’s been cut off is being extremely kind, looks more like it’s been chewed off.

looks like a complete bodge, certainly won’t win “plumber of the year”

Depending on what distance you have got you may be able to cut the black soil pipe back beyond the hole where the strap on boss is and fit something like one of these

Looks like very little thought (or skill) has gone into that installation, the strap on boss looks as though it will discharge onto the sealing fins on the pan connector. Or he may have realised that and cut away some of the fins to accommodate the strap on boss thus reducing the effectiveness...

That’s a Hep2o fitting, replace with a Hep2o tee (you will need a plastic demounting tool) some fittings are “grip ring” first and “O” ring second and some are the other way around. Make sure the pipe isn‘t scored where the “O” ring sits or it could weep, make sure y push it on full socket.

Found DrylinePro fixings to be excellent for Dot & DAB walls,

Look like a crimp system and as such will not be demountable, another thing to be aware of is a lot of MLP systems are imported and may not be ”standard” UK sizes, instead of 15mm, 22mm and 28mm you may find it’s 16mm, 20mm and 25mm.

If the towel warmer is installed on the Secondary DHW system it would need to be manufactured from copper rather than mild steel and to be of any real use would need to be installed on a pumped / secondary circulation system. Otherwise it would only circulate when a hot tap is opened. Much...

Obsolete if it is

It could be Hep2o, the H and V depth insertion markers are consistent with their markings, the black print on the pipe would suggest that it’s “Standard” pipe and not “Barrier” pipe. It should have “Hepworth“ or “Hep2o” printed on it approximately every metre or so. If you aren’t able to...

Another option is to use a compression tee with copper olives, and stainless steel pipe inserts. Shouldn’t need anything else but you could use PTFE tape but not jointing paste.

Searched the part number and this came up, may be worth checking with them Showing as in stock but £100 + VAT Main are part of Baxi group and probably share components across brands.

With Hep2o the 18bar test only applies if very old or “Slimline” fittings are incorporated in the system, this is because they are “O” ring first, grab ring second. Current generation of fittings are grab ring first “O” ring second so require an initial low pressure test (0.5 - 1 bar) followed...

If the fitting “let go” of the polypropylene and caused damage you woul probably be on your own as far as warranty is concerned, most push fit fittings are only covered if used as a system or onto copper. Good practice when connecting one plastic manufacturer to another is to use a compression...

Polybutylene pipe has a minimum bending radius of 8 times the pipe diameter (15mm pipe has a bending radius of 120mm). There are no specific bending tools for plastic pipe, cold form bends can be used to hold the pipe in a bent position, over bending can damage and weaken the pipe.

From the Texecom Excel instructions

Having the Engineer code is half the battle, cancel any maintenance agreement, download the installation / programming instructions, replace the backup battery and if needed come back here if you need any help.