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  1. NODDYNODSVILLE

    Radiators won’t get hot

    Evening all. I have open vented C/H system with a heat only boiler and 10 rads over 3 floors. I have just replaced a rad on the middle floor. Drained system down for new gateway valve for cold feed for header tank. Refilled system no leaks, ?, but the top top 2 rads won’t get hot. ALL rads...
  2. D

    hot water secondary return check valves

    I,m about to change from plastic fitting to copper and want to add a check valve into my secondary hot water return line what prevents the hot water sucking the water out of the secondary return line the plumber that fitted it is no longer here so I cant ask why a check valve wasnt installed...
  3. bgs264

    Shower allowing hot water into cold feed

    Background: I have an outhouse with its own cold feed (with own stopcock). The hot feed into the outhouse is provided via a combi boiler in the main house - and therefore is controlled by the stopcock on the cold feed to the house. Therefore, to totally isolate both hot and cold water in the...
  4. L

    No hot water and heating comes on! Changed 3 port valve.

    I wonder if anyone could help. Problem: We have no hot water and the heating comes on when we switch the hot water on from the boiler programmer to heat the hot water up. Our boiler is a Potterton Suprima or (Supr1ma). What we’ve done so far: My neighbour switched the three port valve so...
  5. S

    Dripping hot water cylinder from upper thermostat... Is it safe?

    Hello I live in a rented flat and have noticed water dripping from the top thermostat of the water cylinder (see picture). It worries me as there is clearly electric wiring nearby, and also another thermostat at the bottom that the water is dripping towards. My landlord's plumber is...
  6. D

    No hot water from hot water cylinder

    Having difficulty with our hot water from hot water cylinder. Now don't have a clue which taps / valves should be on or off. No hot water coming through to the taps at all. Any help would be appreciated. Thanks
  7. S

    Worcester Bosch Heatslave 20/25 Hot Water Not Working

    Hey there, I have a boiler (Heatslave 20/25) that had low pressure. I topped the pressure back up to 1 bar using the external filling pipe but the heating still won't come on. Do I need to reset anything? Thanks for any help
  8. G

    worcester greenstar camray utility 12/18 oil boiler water not hot enough

    I have a worcester greenstar camray utility 12/18 oil boiler and we have not used the hot water for years on the boiler we use it for just heating as we have electric shower and dishwasher etc. This year we thought we would use the hot water, but on turning the hot water on it only heats the...
  9. M

    Hot water control (middle) difficult to turn and temp

    Hi I had a new shower fitted around 18 months ago.The middle knob controlling the temperature got a bit difficult to turn and eventually I had to remove it and attempted to put it back. I gradually found I could not get it cooler and would only come out hot. Does it sound like the cartridge...
  10. A

    dripping hot water tap

    My hot water kitchen tap downstairs is leaking. I can't find a valve in the hot water feed. There's a red wheel valve in the airing cupboard upstairs next to the immersion heater that controls the water into the bottom of the immersion heater (there's also a normal square valve just before it...
  11. M

    Hot water from cold tap help

    Hi I am getting hot water through the cold tap, could this be a TMV problem? TIA
  12. T

    WE need hot ware quicker

    We have recently moved into a 3 bedroom, 2 storey house where to heating is a combi-boiler installed in the loft and the bathroom is in one end of the house on the ground floor. It takes a very long time for hot water to appear in the kitchen or in the bathroom. Do anyone have a solution that...
  13. J

    Hot water pump runs continuously

    I have a Potterton Precision boiler fitted by British Gas 8 yrs ago. All good up to now but in the last few months it has failed to come on a number of times when required by the thermostat. I have had to press the reset button. The pump has also recently started to show it is running at low...
  14. J

    New boiler setup - hot and cold water cycles repeatedly

    Hello - I recently got a new Worcester Greenstar 30i 30kW Combi Boiler 7733600005 installed in my property. Previously I had a 37KW combi boiler but that was 10 years old. But my plumber said that 30KW combi boiler should be more than enoguh. The day this was installed, I also had my water...
  15. A

    Combi Boiler heats radiators when hot water only is selected.

    My combi boiler has started heating the radiators when I select hot water only. Any ideas ? The system has been in for maybe 10 years.
  16. will-i-am-sam

    Cold Shower/ No Hot Water

    ??? Hello there, we have a Bristan Bliss electric shower, yesterday morning it was working fine, my husband and my daughter both had a shower no problem. We had a plumber round to relocate our bath pipes and sink pipes & to fit the new toilet, ready for our new bath and sink to be fitted, but...
  17. N

    Hot water zone valve issue

    Hi I’ve been having problems with my boiler tripping my electrics For a while which has got worse.. I now have no hot water and my boiler won’t turn on for more than 5 Mins without tripping. A gas engineer attended yesterday and said it was water damage from the pipes and the hot water zone...
  18. B

    Hot water only when heating radiators.

    Hello. I have a Worcester Greenstar 24 Ri boiler linked to a Megaflo cylinder. The boiler heats water for central heating but when I want hot water only the boiler does not fire up. I can get hot water when the central heating is on, but not ideal in the summer. The boiler is only 18 months old...
  19. Stanios

    Promax/ Performa hot water switch

    I am sure everyone is familiar with these and the common diaphragm replacement cure for drips and no hot water fix. Just the other week replaced a diaphragm it looked pretty good I put new one in anyway. The pin did come out but only when the tap was half way on at least. Pressure in the house...
  20. J

    Worcester Greenstar 24i. Junior. Hot then cold.

    If the bath top shower is used by turning on the cold tap first, then the hot supply, it will give a consistent short shower, but that is getting shorter day by day before it goes cold. If the hot is turned on first, then the cold, that will result in domestic supply going cold within a few...
  21. M

    Secondary hot water T

    Hi Lads. I'm working on a large house and we need to tap into the secondary hot water pipe to extend it to the new part of the house. Silly question but I have never had to T in more than once and was checking this would be okay to do.
  22. R

    Fluctuating hot water after new rad.

    Hi, Just after some advice from someone that knows more than i do please . Boiler is a viessmann Combi boiler less than three years old. I recently replaced an old radiator and moved the location, I have cut and capped the old pipe work and added new. I froze the pipes to cut but one of the...
  23. S

    baxi duo-tec2 fault code e385

    as above driving me insane about ten people from 27/4 rescue looked at it can not find problem,i get hot and ch but it takes a while for it to come through all the time flashing 385 then all of a suden will fire up and be fine
  24. Z

    No switched live to boiler when hot water tank thermostat demands heat + CH staying on.

    Hi folks. I have a couple of issues, any help advice much appreciated. 1. When my hot water tank thermostat demands hot water (wired into Honeywell wiring centre), I do not get a switched live to the boiler. I get 69 volts ac for both on and off wires from the tank stat. I have fitted a new tank...
  25. G

    Overflow running when heating or hot water on

    Hi all, I have a customer with open vented system,cold feed from f&e tank is teed into flow just above cylinder coil where in enters attic as expansion/vent which terminates through roof The tank overflows whenever heating or hot water is on and stops as soon as boiler/pump goes off,so it’s...
  26. M

    Combined direct vented hot water cylinder

    Hi, I have a combined direct vented hot water cylinder installed in my flat and it works on economy 7. Just recently I have noticed that when I open a hot tap the water didn't come out warm and also after about 2 minutes the cylinder or pipework to it started juddering. Just in case the heating...
  27. Z

    Shower is not activating hot water?

    Hello all, first post here. My shower has been playing up lately. It feels like it's lost pressure and goes cold after a couple of minutes. The copper pipe for the hot water from the combi boiler is cold so it's not activating the hot water for some reason. If I run the tap that activates the...
  28. J

    Worcester 30cdi loud rumble after hot tap turned off

    Hi. Our Worcester 30cdi makes a very loud rumbling noise after the hot tap is turned off. It seems to be worse if the hot tap is only run for a short time. The noise is getting worse since this video was done. Any advice gratefully received.
  29. C

    Hot water variations

    We have a weird problem with the hot water in the house. The system is only three years old with a Potterton Promax Combi and a Megaflo cylinder on the ground floor. Around three weeks ago our mains pressure was fluctuating due to a mains problem and our hot water has been all to hell since...
  30. A

    Manifold hot cold plumbing

    Hello again. I'm moving forward with my new-build project on, I need to plumb my 3 wet rooms up stairs, a downstairs loo and kitchen/utility. Due to lack of availability of a decent local plumber I'm doing the work myself. I wanted to use manifolds for hot and cold supplies. 22mm to feed the...
  31. H

    Why is the water pressure non existence for hot water supply to shower?

    We bought an Edwardian semi detached house just over a year ago (previously a hotel, converted in the mid 90s). The shower (not power or pumped) had low pressure for hot water which got worse over time, then out of nowhere (hadn’t got round to getting anyone to look at it) it was great, better...
  32. G

    Replacement hot water cylinder query

    I'm going to replace my hot water cylinder with as close as I can to like for like. Replacing as it doesn't have an immersion heater. It's a copper vertical 140Litre tank in an indirect vented system and the inlets and outlets seem pretty standard, except it has an outlet for the shower that's...
  33. M

    Baxi Duo Tec 40 HE A Fluctuating Hot Water Temperature

    Hello All, I am currently having an issue with my Baxi Duo Tec 40 HE A not maintaining a constant temperature for the domestic hot water. With a thermometer under a tap & the domestic hot water thermostat set to 43 °C I get a fluctuating temperature from 51 °C to 38 °C which is clearly not...
  34. F

    No hot water can’t repressurise

    Hi I desperately need some help please. We have an oil fed heating and hot water system that has decided to stop working today. Done the obvious checks on the oil, which is fine. But they system is below 1 bar pressure. So suspect this to be the main issue. However I can not seem to be able to...
  35. 4

    Installing Shower Booster Pump

    My Son has converted a spare room into Bathroom in an extension of a long Cottage. The room is remote from the Boiler and Cylinder which feeds the existing Kitchen and 2 Bathrooms. An Inline Powerstream Water provides Hot Water to the Basin and Shower direct from an extended cold feed. This...
  36. A

    Is this pump installed correctly? Pictures keep getting air though the hot water.

    Hello everyone I was wondering if you could help me solve an issue I'm having with air in my hot pipes. I had a positive head pump installed in the airing cupboard as shown in the picture but it would not start without putting the shower head in the bath to increase the pressure. After a month...
  37. J

    Why is my hot water cutting out on waterfall tap mixer shower?

    Hey. Thanks in advance for any help. We have a set of waterfall mixer taps on our bath with a shower connection. Occasionally the boiler would cut out when we were showering. Now, of we have just hot water on, the shower is fine. If we add the slightest amount of cold water, the boiler cuts off...
  38. C

    Rerouting 28mm and 22mm pipes which were connected to old hot water tank.

    Hi I've started to renovate my bathroom and I've come across these pipes which were located in the tank cupboard. Given the property has a combi boiler will these pipes still be in use? If they are will it be alright for me to reroute them so they sit under the floorboards out of the way...
  39. B

    2 radiators on with hot water only

    Can anybody let me know if they've experienced 2 radiators gettng warm upstairs (both above the boiler) when the boiler is only set to hot water. It's a four bed house and the other 4 rads upstairs don't get warm so I'm guessing not divertor valve related which is only a couple of years old. I...
  40. J

    Hot Water Cylinder Temperatures

    150 litre cylinder, top 100 litres are heated by a coil (average temp 70C), the bottom 50 litres (or the whole 150 litres in summer) are heated by a solar coil. There are PT1000 probes fitted in numerous places and the HW zone valve is controlled very accurately by a spare output from the solar...
  41. S

    Penthouse flat, worst cold / hot water performance I’ve seen.

    Hi everyone, I’ve just assessed a top floor penthouse with what’s best described as Sod poor water pressure (1 bar standing, 0.25bar working) at 8/9 lmin... it has a conventional heat only boiler and cylinder in the utility, cold water storage and CH feed tank are about 3m higher in a...
  42. B

    heatslave 12/18 no instant hot water

    greenstar heatslave 12/18 oil combi boiler, 9 years old. when my boiler fires up first thing in the morning its been making a banging nose but it heats up the hot water ok and central heating works ok. the hot water is set to come on by the timer on the boiler on at 5.15am off 9.am. if i use a...
  43. M

    Help! En suit hot sink feed terrible.

    Hi all, First time posting but need help urgently. Our en suite bathroom is the room next to the water heater for the house. All the water pipes in the house are run off 10mm pipes. Our en suite shower has incredible water pressure both hot and col but the en suit tap has almost zero...
  44. K

    Fault / No hot water with Bristan Shower

    Hello All I have a Bristan mixer shower. Pressure is excellent and I have replaced all seals on the Thermostatic cartridge. The CD valve is turning easily and 'looks' as if it is ok. Unfortunately the temperature dial does not make any meaningful difference in the temperature which is tepid...
  45. G

    Warm flow combi boiler /No hot water

    Need help please... My Warmflow oil fired combi boiler will not supply hot water to my domestic taps but the central heating works fine. This is a dual pump system. I have linked out the connections on the boiler stat which causes the hot water pump and system to work and able to get very hot...
  46. J

    Hot Water Issue. Dual Valve System

    Hi All I have an issue with my hot water. I have a gas boiler situated next to a hot water cylinder fed from a water tank in the loft. There are two separate valves one for the heating and the other for the hot water. (No 3-Way Valve) Both valves open when asked to via the controller (Hive...
  47. S

    Priority domestic hot water PDHW

    Hi everyone, I have a customer who needs a new system boiler, currently has a 22kw which I've roughly calculated as enough heat output for the heating (its a 6 bed victorian terrace house), but this doesn't take the 200l unvented cylinder demand into account. Currently the system is setup on S...
  48. M

    Hot water cylinder recomendations. Is Megaflo the best ?

    Hi All. I have found this forum extremely useful, keep up the good work guys. I was having a conversation with a colleague of mine, he reckons megaflo make the best hot water cylinders but I suspect his bias might be because megaflo dont have an external expansion vessel, which makes it look...
  49. M

    Hot water stops working for 1 day every two month

    Hi, I'm based in UK and I've a conventional boiler system, i.e. cold water storage cisterns in the loft, hot water tank on 1st floor and a gas boiler on the ground floor. The boiler is old Potterton Suprima and I've always been adviced not to change it until it completely breaks down, due to...
  50. L

    Cold radiators upstairs (hot downstairs) and little hot water

    Hi. I've an oil-fired condensing boiler (11 years old) in the garage which has two external pumps (Wilo RS50s). I decided to flush out the system and after emptying it via the lower ground floor radiator added Fernox F5 to the tank and turned the supply back on. Running the system leads to the...
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