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I've spent the last few months trying to track down a gradual pressure loss in my CH and it's getting beyond frustrating. Initially, I was losing 0.1-0.2 bar every day. What I've done so far: 1. Checked every radiator valve - found a leak on one which has now been fixed. 2. Checked all...

Could someone point me to advice and terminology for horizontal valley gutters between 2 hipped roofs. Here's an image I found online: https://1stassociated.co.uk/article_images/Roof%20Problems%20Valley%20Gutters_clip_image033.jpg Reason I am asking is 2 fold: 1. I already have one of these...

Does anyone have experience of either of these? Reliance – Aquasystem 500 Litre Potable Expansion Vessel XVES050150 £660 GWS Challenger 450L Accumulator Tank (same as Stuart Turner Mainsboost 450SV?) £690 Both are similarly priced. The reliance has a replaceable membrane. The GWS has a 5...

I've just paid quite a hefty sum for what I believe is a fairly professional contractor to lay a 20 x 12 shed base. This is for a 20 x 12 wood shed with apex roof. I'd done plenty of homework on this one and their work all looked professional and prices were on the higher side of average. It...

As the kids are growing, I'm finding our 250L Megaflo is occasionally running out of HW. What are opinions on having a second UV cylinder vs having a bigger 400/500L cylinder fitted? Any pros and cons? My Megaflo is "only" 7 years old. Is there any resale value to these things, or do I just...

A friend is having 2 new combi boilers installed in a house which is setup as two dwellings. The combi's are replacing an existing gravity setup with two separate boilers. There are also 2 gas meters, if that matters. Both dwellings have their own CH flow/return and HW/CW pipes. The owners of...

I understand the physical difference between the two, but wanted to know in the context of plumbing and heating, when is one used vs the other? Also, in terms of pressure differential, would either stop a buildup of pressure on one side resulting in an increase in pressure the other side?

One of my towel rad valves is leaking intermittently. Doesn't seem to be any pattern to it (i.e. pressure is up on the heating system, but valve is completely dry), however, every few days there is a small amount of water near the valve. And I've confirmed that there is a water stain on the...

A bit of a long shot, but hoping for some ideas on how to investigate this. I'll try and post some pictures tonight, though not sure how helpful they'll be. I noticed a small pool of water in my downstairs bathroom a few weeks ago. Cleaned it up, and noticed it again last week (Friday). Cleaned...

I've not done anything with PLCs before but have a project I'd like to automate at home. Is anyone familiar with this model? Specifically, I need to control 2 x 240V outputs based on 4 x 240V inputs. I believe this would be appropriate: Mfr. Part No. SR3XT61FU...

I'm trying to understand how proportional pressure works on the Alpha series pumps. This graph shows PP as blue lines: You can see the PP2 line maxes out at 4m head at just over 1.5m3/h. 1. Does this mean the pump cannot operate in PP mode at anything over 4m head? What would happen in...

I know the isolation valves supplied with magnetic filters can be poor quality and this one on my boilermag is leaking from the spindle. It only seems to happen first thing in the morning when there's a pool of water underneath it. It took some time to identify it as the source, as it doesn't...

I noticed today that the pressure gauge on my incoming water supply was showing over 5 bar and creeping up fairly rapidly until it went past 6 (that's the max it goes to) and continued. The Megaflo pressure reducing valve should be 3 bar, and this is normally what the gauge shows. The only thing...

I'm finally getting around to tackling the problem of pairing a non-Vaillant unvented cylinder with a 438 boiler. The goal is to be able to reduce the flow temperature during the summer, but have the cylinder heated at MAX temp (80 degrees being the default, I think). I had a previous post on...

A quick question for anyone who's familiar with Vaillants. Boiler is an Ecotec Plus 438 and I wanted to know if the d.2 parameter applies to S53, as it does to anti-cycling? From the manual: d.2 Max. burner anti cycling period at 20 °C Flow temperature Thanks!

Following on from this mammoth thread 5 years ago: https://www.diynot.com/diy/threads/vaillant-438-with-3-zones-frequent-s53.366928/ It's now getting to the stage where I'd like to update my system and do it "properly". The consensus seemed to be a LLH is the best way to go. My questions are...

I've read all past posts on accumulators and wanted to gauge what advantage there was to choosing an off the shelf product such as coldstream or mainsboost, compared to a Reliance 500l potable expansion vessel which has a replaceable membrane. Is there any fundamental design difference which...

I replaced a tap quarter turn valve about 6 months ago and used some plumbers grease on the o ring. I recently discovered that a petroleum based lubricant is the wrong type to use on rubber o rings and that a silicon based grease should be used. The tap has been fine, but is it worth taking it...

A few days ago I needed to turn the hot supply off to change a tap valve and noticed that even with the hot supply from unvented switched off, water was still coming out of the hot tap (albeit at a reduced rate). I've done this previously and the hot would always trickle to a few drops after a...

Bit of a basic question, but what do you call this BSP fitting with an embedded washer: Is it called a bonded washer? And how do you tighten this to a female BSP fitting? It only goes as far as the washer when hand tightening - is that sufficient, or should it be tightened with a spanner...