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  1. S

    Ufh mixing valve and boiler flow temperature

    Hi, I have a combi boiler that supplies hot water to two ufh manifolds. We only have ufh and no radiators. I am trying to find the most efficient way to heat our home. What would your recommendations be on the following ways to set our system up. A) Set the ufh mixer to max so it isn't doing...
    • sam2972
    • Thread
    • boiler flow valve
    • Replies: 1
    • Forum: Boilers
  2. T

    gradual slow hot flow all taps

    This is probably a basic one, but just wanted to check. Hot water flow to all taps has gradually been getting slower over time and the thermostatic shower now needs to be turned up hotter to get a reasonable shower temperature. Its a vented cylinder heated by an oil boiler and the cylinder stat...
  3. J

    Vaillant EcoTEC Pro 28 - radiator flow temp locked to 50 degrees

    Hello all, I’m looking for some advice on my Vaillant boiler, which is controlled by my Hive thermostat. I have set the radiator flow temperature to 75 degrees on the boiler control panel, but the actual temperature never gets hotter than 50. I have done some checks, and believe I have found...
  4. G

    No water in several of my flow meters

    Hi, I have bought a house that has Uponoor water underfloor heating. It was running ok but the recent cold snap has resulted in me being unable to get my rooms warm enough despite the boiler churning through plenty of gas. A little googling and poking around with a torch reveals that there may...
  5. M

    Flow high or flow low?

    Hello I have a new double panel tall column radiator to fit = 325 wide x 1500 high. Looked inside both the header and footer tubes and no sign of baffle plates. What is the best configuration for flow and return? 1. Flow and return opposite sides low down 2. Flow low down return opposite...
  6. Robjolla

    Tee off primary Flow and Return

    Hi new to the forum here and after some advise please. I have done a garage extension and need heating in the room. I am in a town house with no Rads on the ground floor. (Underfloor heating). My boiler (not combi) is downstairs, but megaflow tank is upstairs along with rads upstairs. I have...
  7. Steveo100

    Advice please. Glow worm energy 25c shows "no" re flow temps.

    Had glowworm do some warranty work on it a few months ago. Wondered if he has locked it ? Would be great to check the water and rad flow temps. Couldn't find anything in the manual. Would anyone be able help please ? Tia
  8. iCannon

    Flow issues with a Potterton Heatmax Combi 28 HE

    Hi I have a Potterton Heatmax Combi 28 HE that was installed in 2014. Over the past year or so it has slowly had more trouble heating distant radiators. It was serviced in February 2022 and given a clean bill of health, however since then it now only heats the two nearest radiators and at a...
  9. N

    What can cause intermittent flow on hot tap?

    Can anyone advise? The problem is on a hot tap (not as the cold tap as shown) - the water intermittently stops and then goes to a trickle - turning the tap on and off the water then starts again - the next day it goes back to a trickle. I don't think it can be an airlock - is there a mechanism...
  10. V

    Can I oversize a new combi for DHW flow rate?

    I have to replace my combi (Vaillant ecotec 35kw) and installer has suggested Ideal Vogue 32kw. Happy with his advice regarding the model but I see that the DHW is only 13 l/min whereas on the old Vaillant it was 15 l/min Therefore I was wondering about getting the 40kw Vogue as this is...
  11. S

    Boiler flow and return temps too low but rads arent......?

    Forums ... Old conventional non condensing combi boiler. Worcester 24i rsf. Bungalow (ceiling drop pipes) with 7 rads. I've bled rads. Attempted to balance - Got them heating up at similar times now. Boiler manual states 11 degree delta flow and return. Boiler is set to about 3/4 of max...
  12. B

    Mixer tap mystery - water flow problems

    The previous mixer tap developed a leak. I ordered an exact replacement. The hot &cold tails were too short so I had to replumb the water connections. The new tap exhibited strange symptoms:- In the fully open hot position no water flows. The only way to get the hot to flow is to reduce the...
  13. N

    UFH blending valve reduces flow

    Hi guys, I'm having trouble with a newly installed UFH system. There are 2 manifolds, one with 5 loops, the other with 9. Both are made by Herz, model no 1732007. Pump is a Wilo Yonic Para something something. Boiler is Vaillant Elo Block 14. My trouble is that setting the TMV to its minimum...
  14. M

    High Flow Double Check Valves

    Hi all, I’ve a customer with a failed double check valve on a water softener, it’s 22mm compression but with a far larger bore than the usual DCV’s you see online. Anyone know if they are called something different or where I can get one? I’ve even been on the water softener website and they...
  15. D

    Restrict Flow to One Direction ONLY!

    Hello, I'm a DYI'er and I've recently installed 2 gravity water tanks at my residence. Both the tanks have the same inlet and outlet both connected to each other via a "Tee" connection. I'm having issue with the tank overflowing because of reverse water flow though the outlets. Since one tank...
  16. M

    New part L 55 degrees flow?

    Stumbled across this when researching heat pumps surely this can't be true for gas boilers? And un-enforceable..
  17. D

    Arranging flow/return, will it matter???

    Hi there. I’m currently basically re plumbing my downstairs having already done most of the upstairs. Valiant 35kw boiler in the loft CH F + R both exit in 22mm TEEs off to feed upstairs inside loft Otherwise F+R head straight vertically down through middle of the house (22mm) So im about...
  18. C

    Lower flow temperature in vented HWC w/immersion heater weekly cycle?

    Newly bought home has somewhat older plumbing, but recently fitted condensing gas boiler & HW cylinder. System is open vented. When we moved in we had a few control problems, engineer who fixed it replaced the programmer, said there were a few broken wires (which he somehow managed not to use)...
  19. B

    Mixed UFH and Radiators: Setting Return Flow Temperature control ?

    I have a system with 14 UFH Circuits on the ground floor and 21 Radiators upstairs. We primarily use the UFH plus a few Bathroom rads and then a Rads in very cold weather. I’ve always run the system with the Boiler operating based on - Target Flow Temp setting, but am wondering if anybody has...
  20. I

    Cost to repairing a leaking Worcester Bosch Combi Boiler flow turbine

    Hi there - could someone please tell me what is a reasonable price to pay for a plumber to repair a leaking Worcester Bosch combi boiler flow turbine, pls? Ta!
    • iannutt
    • Thread
    • boiler bosch combi combi boiler flow leaking worcester worcester bosch
    • Replies: 3
    • Forum: Boilers
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