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  1. R

    Secondary Return Pump control

    Hi I’ve just installed a secondary hws circulator and wondered on a sensible control strategy. Pump comes on when cylinder is heating up, but when cylinder is off on the timer the pump will Need to run To deliver hot water to the outlets. I was thinking along the lines of a separate 7 day multi...
  2. S

    Return to work, PPE & COVID 19

    So following from Boris' announcement yesterday, I'm looking to go back to work but obviously I need to ensure I have safety measures in place to protect my customers, myself and my family. What face mask protection level are people using?? If it's FFP2 or FFP3 where are you getting it from...
  3. B

    hot water cylinder return valve setting

    h all , i have a faily old s plan fully pumped system with a worster bosch r 18 heat only boiler, the boiler was replaced about 4 years ago had a potterton neta heat before. 16/18 i think, what i want to know it has a gate valve coming from the cylinder back to the reurn to the boiler , what...
  4. J

    DHW Secondary return configuration.

    Hi Anyone help and advise on the best option for a DHW secondary circulation (SC) layout. Scenario 1 I need to install SC in a large new build. The unvented cylinder will be in the middle of the house and so I would like to have two SC ‘loops’ i.e. T off the hot from the cylinder and go to...
  5. H

    Lowering return temperatures

    Evening all. Enthusiastic have a go guy here! I did get into the whole calculation of heat capacity of flow and calculated resistance after we had a few terrifying quotes when I bought the house - Quite a large 3 floor 7 bed Edwardian house. I fitted a 300 litre unvented cylinder and...
  6. B

    URGENT Worcester 28CDi return manifold

    Does a Worcester 28CDi Combi have to be taken off the wall to change the plastic return manifold?
  7. G

    Secondary return problem

    Had a customer contact me today. They have brought a property that has an unvented cylinder with a secondary return. The property has been extended the hot taps in the original side of the house work ok but the hot taps in the extension side run hot for a few seconds then go cold. The run is...
  8. elvis80

    PEX-AL-PEX for hot water return (manifold system)

    (Bear with me this is my first post on here...) We're putting in a manifold system for the H+C in the bathrooms of our new house (self-build). What are everyone's opinions on using PEX-AL-PEX pipe for our hot water return system, please? Good or bad idea? The pipe says: Tmax 95 degrees C / 10...
  9. eagleeye

    Pump and m/valves on return

    New Vaillant heat only boiler install to replace old Kingfisher floor standing gravity hot water / pumped heating boiler. Boiler on ground floor and dual elson tank in loft. So the new boiler has gone in the position of the old boiler with also with the pump, m/valves and wiring centre. They...
  10. B

    Secondary Return Pump Noise / Air ?

    Hi, Recently I noticed that we were running out of HW more than expected, perhaps it’s people are taking more baths but I wanted to check out if the pair of Vaillant uniSTOR’s were both heating, thinking that maybe I had a problem with one of the Zone Valves were not heating one of the tanks...
  11. B

    Non return valve necessary?

    Hi I’m in the process of redoing my bathroom and adding a exposed thermostatic shower mixer I have a Potterton Titanium 33 (ErP) Combi Boiler My question is do I need to add non return valves to the hot and cold feeds to the mixer ? If necessary what is the maximum distance from the mixer that...
  12. gingalig

    Non return valve on unvented

    Hi, thanks in advance for any advice, I've come to change a manifold for the ufh, I have noticed a non return valve on the main dhw outlet on the unvented cylinder Is this acceptable ? 1570704464 My thoughts are no it's not.
  13. M

    Secondary Hot Water Return on Pumped Shower supply.

    New Shower being installed - thermo mixer - new shower is around 60 feet from HW cyclinder, multiple swept 90 deg bends plus around 10 feet of vertical rise, so negative head - 22mm pipe is installed (15mm last 1 meter) - without pump - dribble so intend fitting dedicated Salmander 3 bar pump...
  14. mgw

    Pump on return is there a problem?

    I know years ago before the TRV the pump went on the return, but new house to me, all TRV's on radiators except for bathroom which does not really count as that is thermo syphon, not worried about boiler as thermo syphon domestic hot water with no motorised valve, but am worried about pump, will...
  15. B

    15mm flow and return, plate exchanger blockage?

    The combi boiler has 22mm flow and return outlets but they are immediately reduced to 15mm as they come out the boiler. After the pipes come out of the boiler, they split off into 3 branches. Branch 1 is for a single radiator only. Branch 2 feeds about 9000BTU diownstairs and branch 3 feeds...
  16. A

    Non return valve- Hot water bath?!

    Hi (System is header tank in loft, indirect hot water tank) After the hot water isolation valve under my bath, there is a non return valve between the isolation valve and the hot water tap. When I switch the hot water (mixer tap) on in the bath nothing happens until I flick the SINK mixer...
  17. G

    Non Return Valve on low pressure system

    Hi, Previously wrote on here as the tank in the attic was overflowing due to mains pressure back flow up the hot water tank fed pipes. Resolved this issue with a NRV on the hot pipe coming from my twin pump. (See pic) Solved my issue but because the NRV is spring loaded the pump doesn’t...
  18. H

    Identify Boiler Return

    Hello Forum, Please could you help confirm that Pipe 'A' is the boiler return? - Pipe 'C' confused me, but I believe it is the return from Upstairs/Downstairs heating zones. Pipe Description A Boiler Return? B Boiler Flow C Return from Upstairs/Downstairs heating zones? D...
  19. A

    Why does filling loop have to be installed to the return pipe?

    Hi all Im a 'Registered Professional Gas Engineer' and just after clarification into this,as genrally manufatures state to install on return pipe of boilers. Im only asking for advise, as a senior 'Registered Professional Gas Engineer' said to me that its best to install on the flow side as when flushing the system connecting to the filter, it helps filling water...
  20. D

    Underfloor heating - supply & return flow temperature question

    Hi I have a wet based underfloor heating system and I've noticed that the stone floor in our kitchen isn't warming up evenly. There is one patch that is much warmer than other areas. I have noticed that when I look at the manifold the supply temperature is running at around 50 to 55 degs but...

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