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mains

Davidson's Mains is a former village and now a district in the north-west of Edinburgh, Scotland. It is adjacent to the districts of Barnton, Cramond, Silverknowes, Blackhall and Corbiehill/House O'Hill. It was absorbed into Edinburgh as part of the boundary changes in 1920 and is part of the EH4 postcode area.
Locals sometimes abbreviate the name to D'Mains.

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  1. S

    Mains Gas Supply Pipe Repair

    I was using a mini excavator in the front garden and cut the mains gas supply (website with gas location had it in the wrong place, but a disclaimer saying their info might be inaccurate - the engineer said it was probably moved when they changed the pipe to the new plastic sort). 1 Cadent...
  2. E

    Intermittent Pressure from Mains

    Strange problem but over the last few weeks we've started getting really unusual water pressure problems through-out the house. One minute, we have full pressure on all taps and the next, either low pressure or no water at all. Today for example, at about 1pm, we had no water anywhere in the...
  3. M

    Crazy high mains pressure

    Hi to all in the forum! I have a 6 bar pressure relief valve attached to an under sink heater and it was always dribbling a bit. Today, I finally bought a new pressure gauge and was astounded to measure the pressure at 7 bar! I usually find most mains to be between 2-3 bar and so it seems...
  4. L

    Non return valve to mains supply

    Hi Guys. I will be fitting an outside tap in my house. Teeing off under sink and direct to outside. Should i install a non return valve on mains ?
  5. A

    Routing mains water pipe under the floor?!?

    Hi, I have my mains pipe coming into the side of my house which is copper. I am going to have the adjacent wall studded out (to the left in pic) and therefore want to hide the mains pipe behind it and put on a low profile stop tap in which can be accessible via a flap or something. There is an...
  6. C

    Mains HE boiler help

    Hi, I’m struggling to locate the stopcock in my flat and I need to isolate the boiler so I can swap a bath tap over. Can I isolate it from the water feed on one of the inlets on my boiler? I’ve attached a pic. It’s a Main Combi 24 HE. All my cold taps can be isolated individually but my hot...
  7. D

    mains water pipe be run through an integral garage?

    Can a mains water pipe be run through an integral garage? It's to feed a washing machine used 2-3 times a week. Is there a risk of the pipes freezing?
  8. T

    Mains cold water knocking out gravity hot water in bath shower mixer

    Hi all. My customer has a bath shower mixer that gets cold from the mains and hot from a vented cylinder and the cold knocks out the hot. I'm thinking about putting in a thermostatic bath shower mixer but would appreciate any other ideas! Cheers all/
  9. B

    Is powerflush really any better than chemical plus mains flush? (before boiler repair)

    Hello, BEFORE I cleaned the system last year with a mains flush. There was a little inky stuff and a bit of sludge at the very end when I emptied out the rad I took off the wall, but no rads have ever had cold patches. Most pipes are hep20 but I had small section replaced by copper 2 years ago...
  10. Stants

    Mains uprating is 32 mm that much better than 25 mm

    Hi sorry if this is a silly question I'm having a new heating system installed ( un vented ) my new mains is due to be installed ( moled ) in 25 mm MDPE , the Water companies going to replace the communication pipe under the lead replacement scheme , however its been suggested to me to...
  11. A

    Top floor Flat - Mains Booster advice

    Hi All, I have a GrundFos Home Booster, the 3.5bar version which has transformed my flat, its used for every tap aside from the kitchen cold tap and the kitchen white goods that need mains, it also supplies the pressure for my combi boiler that is the hot water and central heating system. I...
  12. JLS

    Mains Inlet through loft

    Was asked to look at a Mains inlet today that the property owner wants moving. It currently comes into the hall in black HDPE , through a concrete slab and about 6 inches up the wall in copper, then poly up the wall and through the unheated loft space. It's not pretty, but at least whoever...
  13. B

    Where does my water come from if not mains?

    Hi everyone I was under the assumption that my flat was mains fed throughout but the water company said "We supply cold water to your cold kitchen tap". So my question is where does the water come from to supply water to the hot water taps in the bathroom and hot water tap in the kitchen? I...
  14. M

    Mains feed and vent pipe on vented system

    I have a boiler to swap on a vented system. The open vent was presently attached straight to the boiler. And the cold feed is tee'd in to the hot water return near the coil. When I install the new boiler (it's staying vented). Would I be best off changing the cold fill postion I will obviously...
  15. C

    Mains high pressure

    Has anyone come across extremely mains high pressure in a domestic property ?..? I used 2 gauges one at 6 bar and other at 10 bar both were off scale when static. I was shocked at the readings. Have since fitted PRV. Just seeing if people have experienced the same.
  16. R

    Mains Water Treatment Question

    Hi, new to the forum, found you because I have a question! Partner wants us to install an alkaline water system in the kitchen, something like this, but I'm doubtful of any positive effects. Was thinking maybe to appease I could get a UV disinfection system like this, but can't figure out if...
  17. B

    Does an unvented cylinder really have to be connected to the mains?

    This is my first post on the forum... but I've been around a while, lurking. Hello! I'm hoping someone can advise me with a question about unvented cylinders. I'm told they must be connected to the mains and can't be gravity fed, but I'm having trouble understanding why... if the pressure and...
  18. topalondon

    Leaking ball valve from outside mains

    I have a Plimex ball valve that is the inside stop tap for the mains supply that has recently started leaking. It’s only 2 years old (when property was renovated) and suspect it could be due to thermal cycling with the cold weather. Access is restricted as the pipe work was put behind a plywood...
  19. K

    Leaking mains stopcock

    The internal stopcock was closed for the first time in about a year as part of a bathroom installation. Now that it's open (I leave it a quarter turn from fully open) it has a slight leak, approx half an egg cup full in 24 hours. Should I get it replaced? Thanks in advance.
  20. D

    High pitched note from mains water pipes

    I have a flat in a 1920s UK block. The mains water feeds ~40 flats, of which I am one. There is no local boiler, though there is a communal one for the whole building. Recently, always at night, the mains water pipes have started to vibrate at a high frequency - emitting a "singing" note ...
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