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pump

  1. R

    Replaced Central Heating Pump - still have issue

    I have a conventional system, Potterton Prima Boiler, into a Pump into a Motorised Valve that feeds the Radiators and/or the pipes in the Hot Water Cylinder. Analogue Controller with slide switches (replaced 2 years ago) and analogue Room Stat and Hot water cylinder Stat. I'm just an amateur...
  2. B

    Heating not working - Grundfos pump issue

    Hi all, I have an old Combi boiler for which the heating has stopped working. The hot water is fine, and I think I've isolated the problem to the pump. The pump is a Grundfos Alpha2, and it has usually has two numbers, but it is instead showing two dashes ( -- ). I think the propeller isn't...
  3. S

    No heating flow. Pump and diverter working, what else could be wrong?

    Hello all, I have a WorcesterBosch Greenstar 42CDi classic combi, which is providing DHW fine, but not heating. Was working fine in spring, probably not been used until recently now it's colder. When heating is called for, the boiler fires up ok but soon shuts down the heater as the...
  4. D

    Wood burning stove with air to water heat pump

    Is it possible to install a wood burning stove with an air to water heat pump? I was speaking to a few plumbers who have said this is not possible as the air to water system is a pressurized system and the stove needs to be in a vented system.
  5. B

    Grundfos UPM3 pump won't turn despite being clean

    Hi there, I've got a stuck Grundfus pump again, but this time the usual tricks don't work. I took it out, cleaned it, still won't turn. Hand pressed against the rotating bit, screw pressed in, no movement. Tried the same both plugged and unplugged. The black propeler thing won't budge. Is it...
  6. I

    Heat pump cylinder in outhouse in Scotland

    My landlord's great at getting all the Scottish government funding that's going, and there's full insulation, double glazing, an airsource heat pump and a Mitsubishi Ecodan unit. The Mitsubishi installation manual says in big letters "The cylinder unit MUST be located indoors and in a frost free...
  7. C

    hot water circulator pump vibration

    Hi everyone, My flat is located next to a communal boiler with a hot water circulator pump ( Grundfos UPS 15-50N Secondary Hot Water Circulator ). The pump is noisy and vibrating. Would installing a more powerful pump solve the problem? Many thanks for your help!
    • ChristineLondon
    • Thread
    • hot water pump water
    • Replies: 2
    • Forum: UK Plumbers Forums
  8. M

    shower pump always on

    Hi - I am looking for help regarding new shower pump. -its new -it always stays on when the power is on. It should only switch on when water goes to the shower -its noisy Can anyone advise please? Many thanks Iain
  9. K

    Mains boost pump in top-floor flat

    Background I have a small one-bedroom flat in the roof space in a victorian house. There are three floors below and each floor has a single one-bedroom flat. The mains pipe bringing water into my top-floor flat is 15mm copper pipe. There is a water meter in the flat and a stop valve. There is...
  10. IMRS250

    Anyone work for Octopus? Airsource heat pump upskill role

    Hi all, I have recently returned to the industry and have applied to Octopus for the upskill role into air-source heat space installs. Does anyone work for them on here? Just wondered what people's thoughts were on them as a company and if anyone is fitting air source what they think of this...
  11. C

    specialist in pump installations

    Please help, I have purchased two different pumps, and I don't want to get the 3rd one wrong too. I need 5 litres in 15 seconds in order to operate this smart toilet: https://uk.homary.com/item/modern-black-smart-onepiece-128-gpf-floor-mounted-elongated-toilet-and-bidet-with-seat-42877.html I...
  12. notsure

    Grundfos Pump Domestic, Speed control

    I'm making my own replacement for a boilermate 2000 controler. I need more electical information on the pump so I can work out how to control the speed on it. does anyone know where I can find detailed electical info for this not just "on off" it looks like the original controler used PWM to...
  13. euge595

    Groundfos super 4 water pump

    Hi, Can I replace the head of a grundfos super 4 with a later grundfos model?
  14. D

    Circulation pump with electrical speed switching for wood boiler stove

    Can anyone help, please? I'm looking for a heating system circulation pump for a domestic install, with 3 speeds, where the speed can be toggled electrically as well as via a push switch on the pump body. I'm using this pump with a wood boiler stove, where I want to run the pump at its slowest...
  15. dave100

    New unvented cylinder / Replace old vented cylinder and add a ST pump?

    Hello, I am renovating a small bathroom in an apartment on the 5th floor. Heating is electric, no gas or oil. I have four (related) questions about this below. I had intended to reuse the cold water tank and the cylinder sitting underneath it but my plumber suggested I replace the cylinder as...
  16. Z

    Unvented cylinder in loft pump on landing, any problems

    So after having engineer drawings back I'm limited to around 90cm of loft height. I was thinking of a preplumbed horizontal cylinder. But now wondering if a pump and zone valves on the landing in a separate cupboard with just the cylinder flow return going to the loft. Is this an ok idea of...
  17. H

    Requirement Circulation pump for the hot water secondary Return

    Silly question (and might already been asked 100rds of time) - I am specifying a circulation pump for the hot water secondary (circulation) return to reduce the wait for hot water. HW is coming from unvented cylinder with a secondary return connection. The secondary return is almost straight...
  18. M

    Heat pump unvented install balanced cold

    If changing a combi boiler system to a heat pump. What do they usually do with the balanced cold connection on the hot water cylinder? Cap it. And put a pressure reducer on the mains so they have equal hot and cold pressures? I can't see them repiping a balanced cold from the cylinder to each...
  19. S

    whats a more powerful pump then a grundfos ups 25-50 130

    Hi i have a grundfos pump 25-50 130 p/n 59525418 radiators downstairs are cold and upstairs hot after an 1-hr 2 hrs then the downstairs gets hot i think the pump i have is too weak would would be a more powerful pump to help with this ? thanks
  20. L

    UFH + heat pump - is it connected correctly?

    Hi, we had UFH installed dowstairs in our house recently, and I'm not 100% sure that it's connected correctly. I'd be grateful if someone could have a look at the diagrams and tell me if what the plumber did makes sense. The house is heated with an A2W Samsung/Joule heatpump. The buffer...

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