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Although the HX is at the back, it's not that hard to get it out..... But it's easier if you remove the gas valve first.

I'd agree you need to be able to inspect joints but 'whole length' would mean that you couldn't put a flue through a wall! Is your point that the OP wanted to put an elbow in the void of the chimney and you couldn't inspect that? Didn't get that from the OP.... Anyway, at some point...

It's not generally regarded as good practice to put pipes in 'invisible' places where they might get drilled later. But with no viable alternative, down the middle of the stud-wall is pretty safe, especially if it's obvious (from the rad position, other pipe routes, etc.) that they MUST be in...

All you've done most recently is illustrate how little you 'care' about. Maybe it would be easier to explain to your customers why a pressure problem lay with National Grid and not with your work, if you actually KNEW what the probable cause was? And customers (believe it or not) are not...

Yup - including 'safe' working pressure according to the MI of all the appliances connected and 19mB as an 'industry agreed' backstop. So exactly what part of what I wrote did you disagree with? And (assuming that you WERE aware of the origins and consequences of supply pressure problems...

Dear oh dear oh dear! WERE you aware of the problem I outlined? If so, no problem for YOUR customers, then! OTHERWISE, I think it's your turn (once again) to disappear up your own orifice.

Why do you think the system is 'unbalanced'? With a fully-pumped system and TRVs, even on microbore pipework, pump output should be adequate to get enough flow through all the rads without a lot of tinkering about (after all, once an area is warmed up the TRV will shut and the flows should...

The point to note about this is the effective SIZE (as well as condition) of the service pipe (street to meter). Transco / National Grid practice is to 'line' old and unserviceable steel pipes with (yellow) MDPE, from street to meter when they're re-piping the street, or from meter to street...

Concealed shower valve connections are (IMHO and Softus permitting) a nightmare and an accident waiting to happen. My preference is to only use solder joints which will be then inaccessible in a wall. The valve types that fit into a mounting box in the wall and / or have a large cover plate...

There's a new & relevant petition on the PM Petitions website which everyone, especially workers in gas plumbing and electrics, should have a look at and (I hope) sign. See http://petitions.pm.gov.uk/Certification/ The reference to the Construction Industry is a bit misleading -...

You can get a 'flexible file' (actually a steel wire with teeth on it and rings at the ends) which can be used when clearance is virtually non-existent. Be careful you have a good plan for what happens AFTER the cut!! :(

Gas-provided heat may well be around 2.7p / Kw NOW. But it will soon be a lot more expensive than that! With much of our natural gas coming from dodgy parts of the planet, in some cases via VERY expensive transport (refrigerated ships), I cannot see any path for gas prices except up...

The pipework of the gravity system may be absolutely fine (even if a bit big!) and could be reused to connect boiler to cylinder. In practice, you'll need a new cylinder (more lagging, high-efficiency coil). Boiler is anything suitable for the proposed site and heat requirement. It's...

Non-syphon flush valves (as in WC cisterns with push buttons) often leak due to grit, limescale, etc., on the seating at the bottom of the valve assembly. In most cases, the valve body can be unlatched and removed without tools (and no force!!), and the seating cleaned.

Must confess I had similar doubts about some of the wording. There is absolutely no doubt, however, that the ACS system cooked up by CORGI and its 'industry and training cronies' is NOT delivering competence. Nor, actually, is it supposed to! ACS is supposed to 'demonstrate competence', NOT...

There's a new & relevant petition on the PM Petitions website which everyone, especially workers in gas plumbing and electrics, should have a look at and (I hope) sign. See http://petitions.pm.gov.uk/Certification/ The reference to the Construction Industry is a bit misleading - inadequate...

The situation with Response heat exchanger is as follows (I've done 2 in the last year and several more before that): - they fail, as described, and can cause leaks under left hand side of boiler and / or ignition problems earlier, before the leak! - replacements are ONLY available direct...

If HT is geting to the electrodes but the boiler still fails to light - has anyone actually CHECKED that the electrodes are dry? Probably the commonest problem with Responses is broken heat exchangers, usually resulting in water running out of the bottom of the boiler. But a less serious...

Something has been overlooked here! IF you can get Baxi Potterton to court, you will presumably have the opportunity to question THEM about certain inconvenient FACTS that will support YOUR case. First and most important: how many Suprima PCBs of the various mod levels and versions have...

...hmmmm Never occurred to me that anyone would fail to realise that a combi only fires up when water flows - so at best the water in any kind of downstream storage would be tepid. Unless of course it's a proper setup like the Vaillant Ecotec 937 with a tank with a circulating pump to trigger...