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3 port valve heads are notorious for going faulty, it's the way they work. They all eventually burn out over time. Just match up the valve head types and then change the head. In the summer it might be an ideal to change the system over to an S plan, as long as there is enough space in and...

It's to divert the flow upwards and stops the water just running along the bottom of the rad and then up. The rad will not heat up properly if it's reversed, the flow needs to be on the baffle side of the rad. Is the system microbore? 10mm pipe?

looks like an older auto bypass. Wind it to it's highest setting, just remember where it was set. Though I would say that the bypass leg would also need to be flushed too.

Or if you have a handy angle grinder, much quicker.

It should be - the difference is between the design of a drop tight valve as against a standard Pressure Reducing Valve (PRV). As well as when water is moving, when the water isn't moving then a drop tight valve should lock shut and stop any creep by the way the spring and diaphragm is...

BG tend to do a powerflush as a matter of course - Don't get me wrong a properly performed powerflush is excellent and it certainly works well and should leave the system nice and clean, it just isn't needed in a lot of cases IMHO and usually adds a significant costs too and the better quality...

Oh dear :eek: :ROFLMAO:, apols, really didn't mean to diss any of his pals but the fact that you have 2 working bathrooms and a cloakroom and there if there is any possibility that more than one hot outlet will need to be run at the same time, say shower and bath, 2 showers, shower/bath and...

yes, a good cleaner that can happily sit in the system, X400/F3/MC3 etc can be added but the system does need to be flushed and filled and flushed and filled a few time to clear everything out once it's been in there a while. As long as you can mains flush the system clean through flow and...

Nothing to say that the current system you have couldn't go to sealed either, would need to see what boiler you currently have etc and just exactly how you system is fairing at the moment. As @DP suggests, if you give the general area where in Glasgow you are, I'm sure that there will be more...

Most definitely. Anything with narrow waterways and flexi's will slow down flow, more so with a gravity hot feed and unbalanced supplies

+1 - not required.

Had trouble with backing up before now with the low head volume in a shower, especially the Wirquin ones, more so with long hair.

I'd just add an anti vac basin trap onto that, just to stop any gurgling @ the basin trap if either the basin empties or if a full bath is let go.

Oh dear - You are talking to the wrong folks if all they are saying is to throw a combi at it. Especially with more than one bathroom. (edit) Unfortunately, your husband is listening the wrong advice. What you're asking for is not really a difficult job, no. More money to them in a swap though...

'Fraid not, that connects the opposite way to a bar shower. Your exposed shower feeds are tails that come through the wall, then a nut and olive is placed onto them (in essence a female connection) and then the valve's connections being male then fit onto the tails and connect up to the...

Oh dear - yes I would certainly call that a bit of a bodge. Not sure how they managed that though as that's a solvent weld elbow onto presumably a piece of ABS, that then should be too large to fit into a push fit coupler. Anyway, ideally you would get someone in to fit it properly to ensure...

'Fraid not - The waste pipe run itself would need to be vented, ideally upstream or very close to the trap. If the run was vented then that would probably mitigate self syphoning - i.e. the water from the shower filling the waste pipe and then creating a vacuum. You don't tend to get anti vac...

Oh yeah, the black vertical running up to under the trap connection, that the standpipe is connected too. After looking again now seeing that it doesn't go anywhere :ROFLMAO:

The whole point of the condi trap in the boiler is to stop that from happening, if that trap did go dry for some reason then worst case then yes POC's could travel down the condi pipe and enter the room. Though it does sound like someone trying to drum up some work. The other point about...

Where is the smell prevalent? Is it from the top of the standpipe? I'd agree with the others that it's unlikely that the standpipe's 75mm trap is being pulled dry by the sink but just to check. Cut a section out of a thin plastic bag and place that over the top of the standpipe and then fill...