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  1. O

    Bristan shower mixer - piece missing?

    It needs a backplate, which I think you'll be luck to get. There should be a grubscrew going through the back of the shower valve body at the back on the underside. Shower looks like Bristan KN2 SHXAR
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    Balancing radiators where TRV is on the return pipe

    Agree with Madrab, doesn't matter which end. However, if one end is in a corner where there isn't going to be much air movement, I prefer to put the lock-shield on that end, so that the TRV can better sense the average air temperature of the room.
  3. O

    Balancing radiators where TRV is on the return pipe

    With decent bi-directional TRVs its better to have the TRV on the end most exposed to the room's air temperature. Having it this way makes the TRV more responsive and in line with the room's actual temperature so that it can regulate the water flow more effectively. So I wouldn't be in too...
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    My boiler reads 25.5 BAR pressure on the display, and I cannot figure out where my filling loop is. Any ideas?

    1. As opps says, the boiler is self filling. 2. I'm still puzzled by the lack of pipework. Probably me. 3. Its a fairly sophisticated system with a low loss header. I think you may need some professional help to get the mystery pressure reading sorted.
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    Brass olives leaking should I overtighten?

    1. If you are talking new pipe, new olives and new fittings, then tightening them should be OK. Normal tightness is of course a bit of an experience and feel sort of thing, but you won't go far wrong with (from the start): 1a. Firm finger tight. 1b. An additional 1/2 turn with a spanner while...
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    Changing shower thermostatic control cartridge - DIY or not?

    My opinion: 1. If you can identify the precise make and model of shower, and you can isolate the hot and cold supplies to it, then it is a DIY proposition. 2. If you can't do either or both, get someone in. Worth checking to make sure any filter(s) / non-return valve(s) aren't blocked before...
  7. O

    My boiler reads 25.5 BAR pressure on the display, and I cannot figure out where my filling loop is. Any ideas?

    1. Exact make and model of boiler please. 2. What you've shown doesn't look like a combi (not enough pipes), and if not you may well have a heat only boiler which might mean no filling loop required. 3. As you say, 25.5 bar cannot be an accurate pressure figure. I'd have expected vertical...
  8. O

    What pump should I have installed for my hot (and cold?) water taps

    My post #2 should read ....if the total is more than ....
  9. O

    System not working after replacing 3-port valve - Air Lock?

    Are all the valves you touched during drain down returned to their original positions. In particular, are the pump valves open.
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    What pump should I have installed for my hot (and cold?) water taps

    1. Just put a timer on the electrical circuit to that pump, or fit a PIR light activated switch to turn it on when someone moves around the sensor. 2. It is really a circulator rather than a pure pump, and will have little or no impact on water pressure. 3. With simultaneous showers: 3a. It is...
  11. O

    Megaflo Hot Water Valve?

    1. The one with the red handle will only stop the hot water. It shuts off the mains water going into the cylinder, and is it this which pushes the hot water out of the top, it cuts the flow of hot. 2. The black plastic handled valve cuts off the mains to combination valve (black plastic /...
  12. O

    Radiator not working

    1. If the radiator has a thermostatic radiator valve (TRV) it is possible that the pin which operates it is stuck. The TRV will have a larger head than the other valve, with numbers or symbols on it. Remove the head, usually by undoing a knurled locking ring, but there are variations. Push...
  13. O

    Towel Rail on Hot Water Feed Not Getting Hot

    There are two main types of Domestic Hot Water (DHW) connected radiators: 1. Ordinary radiators / towel rail made of mild steel or aluminium (or copper / brass) connected to the primary coil inside the hot water cylinder. The primary coil contains hot water heated by the boiler, and transfers...
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    Replacing bigger for smaller rad - design question

    1. You are likely to be cold. The proposed new radiator won't be able to keep up with the heat loss from the room at or around freezing outside temperatures. 2. With the move away from fossil fuel heat sources to things like heat pumps, the circulating water in an economically priced system...
  15. O

    No hot water - thermostat on water cylinder clicking - third replacenent valve!

    1. Its a two port valve, not a three port. 2. The advantage of a spring return valve is that it fails to closed. 3. An unvented hot water system requires a valve that fails closed.
  16. O

    No hot water - thermostat on water cylinder clicking - third replacenent valve!

    1. Without a dimple on the cover, I suspect that is not a Honeywell valve but a "cheapo" look-alike. 2. I'd suggest getting it changed to a genuine Honeywell V4043 22mm compression valve. E.g. Screwfix 31480. 3. It's not a DIY job, and requires someone with a current membership of a recognised...
  17. O

    Ripples in Bent Pipe

    1. Should be OK. The copper within the ripples is in compression so should not have thinned. 2. Pipe is standard size (15 mm OD, 0.7 mm wall or 22mm OD, 0.9 mm wall) 3. Make sure guide and former are clean, pivot bolt is tight and roller free to turn. 4. If the pipe is hard, you could always...
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    Can somebody link me a fitting for this purpose? Screwfix or amazon preferably

    1. As you can see from your last photo, the diameter over the threads = 4 1/16 inches less 3 inches = 1 1/16 inches = (approx.) 27 mm, which allowing for measurement errors is 3/4" BSP. Note 3/4" BSP does NOT mean 3/4" over the threads, it refers to the inside diameter of the pipe associated...
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    Can somebody link me a fitting for this purpose? Screwfix or amazon preferably

    1. Very unlikely the threaded shank of the tap is 22mm. Much more likely to be 3/4" BSP which has an outside (over the threads) diameter of just over 26.4 mm. 2. If the above is correct you need something like Screwfix 36420 3. Photograph(s) of what you have nearly always useful.
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