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Not Preston but it was in the NW. Not a lawyer, are you? :wink: ChrisR: Understood your point about copper not forming its own protective surface compounds but the simple fact that it goes dull must mean it's reacting with something. What would that be? If I remember the chemo rightly, it...

Kind of you to offer but you've hit a sore point. The digital camera went on the blink this very afternoon, just when I needed it. Perhaps it overheated :cry: So until Christmas Day (is there a smiley for fingers crossed?) I'll describe. The boiler is in a solid walk-in cupboard with a...

You guys are stars. A few other observations: Unfortunately, placing the pump on the return would involve major surgery (MV less so). The layout of pipework is more convoluted than my diagram suggests and there's physically nowhere to put the pump without losing circulation on the rad...

So gentlemen, if I may trouble you once more. How does this look now?

A housebuilder client of mine has just had to replace, at enormous cost, most of the copper pipework in a block of 54 flats. Leaks appeared less than a year after it was built and every time they replaced one leg of pipe more sprung up elsewhere. It turned out the whole batch was suffering...

That's the last time I make a cup of tea. Chris, you're a genius.

Only two things matter 1. The height difference between your shower and the feeder tank (head of water) 2. The length and diameter of pipework between the two. Enough head, it will work. Suck and see

Oooh Chris, much as I love you, you can be exacting at times. Boulter manual says nothing about combined vent/feed so presumably it's acceptable. Wouldn't this kind of drastic pressure escape via the (unrestricted) return? Gasgeezer stresses the need for a 15mm feed and 22mm vent. So is...

Where were you born? Arizona desert?

You guys are so kind to take an interest in this self-inflicted problem. So am I correct in thinking the proposed setup (plus gooseneck vent yes/no?) is OK as long as a PRV is fitted? Yet does it even need one? Extract from Boulter manual... "The Boiler is fitted with a safety...

Sorry, confused by lingo. By upstream you mean "before", as it were. That makes sense. I have relatives in Australia. Oilman has just posted. Thanks, old bean. EASILY? OK in principle but this is exactly what I'm trying to avoid. It's a long and tortuous route from boiler to F&V tank. I...

And herein lies the problem. Some major re-engineering would be needed to make things "normal". A couple of questions if I may. If a combined F&V eliminates pumping over, why does it have to be downstream of the pump? Problem with downstream location of MV is more obvious, but if this...

Chris - to close the chapter (hopefully), Shower Doc was certain it's the PCB from the symptoms. "They go all the time on that model" said the gruff scotsman. I've ordered a replacement. The unit isn't that old and it still leaves us over £100 in pocket. If he's wrong he's a dead scotsman...

Starting a new thread as this had veered off-topic. Are you serious? Where would expansion be taken up - in the feed tank? What happens if the system boils? What we have (starting from boiler flow) is boiler - pump - auto bypass - MV - vent - HW cylinder - feed - boiler. Note vent is on...

Are you serious? Where would expansion be taken up - in the feed tank? What happens if the system boils? What we have (starting from boiler flow) is boiler - pump - auto bypass - MV - vent - HW cylinder - feed - boiler. Note vent is on flow side of cylinder, feed on return, and both of them...

Good thinking, Pike. As a last shot I have emailed the Shower Doctor (showerdoc.co.uk) who claims to be a whizz at diagnosing faults and sending the right part. If he thinks it's the PBC then we will have to make a decision... like where to put that extra shower :lol:

Donver, people like you do not deserve any help. One light-hearted comment and you throw insults at everyone. Perhaps you'd like to learn how to type before slagging off other people. Go away, you rude man (although you probably have already, now you've got what you wanted).

Worse. I hardly dare admit it. Shall we say boiler - vent - feed - pump - bypass - valves. Perhaps not a non-compliance but might explain the pumping over. Currently trying to work out a solution that doesn't involve demolishing the house.

Ah, is that what you're after? Ever thought of becoming a lollipop lady? PS You'll be delighted to hear I have found a non-compliance in the DIY heating system.

Neutral is at 0V to earth. Live to neutral reads 240V (actually 215V but my multimeter is old and shows the same at any other point on the ring main). Circuit after the thermal cutout can power a 100W bulb happily yet the shower must only take a few mA when dormant. What am I missing? New...