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heat

  1. N

    Water cylinder re heat time

    Hello all, i am doing work for a customer who has asked me what the reheat time of a 250 litre cylinder is. To be honest after all the years of doing plumbing this is a question that i have never been asked before because usually if you need a hot water cylinder then it is what it is, you just...
  2. G

    Power flush before blocked heat exchanger renewal ?

    Evening All We are having a new heat exchanger fitted to a Veissmann boiler, the boiler is only six months old, the installers carried out a power flush but only after the boiler had been running for about a fortnight, then after six months it failed to heat radiators to temperature. Viessmann...
  3. L

    Heat exchanger for new boiler on legacy open vent system

    Hi, We are planning to replace a 50-year old boiler for the communal heating-only (no hot water) of a residential block of 12 flats with 60 radiators. We have an open vent system. Our heating engineer recommends the GB162 100KW, WITHOUT a plate heat exchanger, because he says that heat...
  4. G

    Baxi duo tec 28 heat exchanger problem

    Our boiler went off with error 133. I investigated and found the ignitor module had melted! This was replaced. When the boiler fires up now there is intense and immediate heat radiation from the left upper and lower front side of the heat exchanger unit. I switched off immediately and have a...
  5. S

    Hi have a potterton performa 24he hot water flow is very slow. Have changed plate heat exchanger and made no difference any ideas?

    Hi have a potterton performa 24 he hot water flow is very slow. Have changed plate heat exchanger and made no difference heating is fine any ideas?
  6. M

    Combi boiler pre heat

    On average how much a year would you suggest it cost to keep.the hot water preheat on. On a combi boiler. Thanks.
  7. P

    Worcester greenstar 18ri heat exchanger/heat cell

    Plumber says the heat exchanger aluminium baffles are breaking down and blocking the pipe which he showed me,now the question is do I change the heat cell or go for a new boiler. My boiler is 13 years old.
  8. R

    "Main" (Baxi) 24HE A Heat only boiler temperature setting

    Hi. Bored and wondering about a friend's boiler that was fitted a few years ago and that, having been involved with the heating system, I take an interest in. One of these jewels...
  9. M

    Blue light constant on Worcester boiler but no heat

    Blue light on but no heat from radiators. When I reset the boiler, there is a slight chugging noise like it’s wanting to fire up but can’t. The blue light is on constantly
  10. R

    air source heat pump central heating

    Hi I have had a brand new and very expensive air source heat pump installed together with radiators etc (had storage heaters before). The water tank is in the airing cupboard on the first floor. I am hoping someone on this forum has experience with these systems. I have two questions. How long...
  11. V

    Any clever ideas for cleaning soot blockage from Grant Condensing Heat Exchanger?

    Anyone got any suggestion on how, if possible you could clear soot from the condensing heat exchanger of a Grant Vortex. Have many of you encountered blockages like this? Have any of you been able to avoid condemnation of the boiler the due to the stainless heat exchanger being blocked? What can...
  12. M

    Expansion position heat only boiler

    I know when installing an expansion vessel it must be connected to the system without any isolation valves. How is best to pipe in to the system so it can't be isolated. In the diagram below a potential way I was going to pipe in to a heat only boiler. It could be isolated by isolating the...
  13. Husk24

    World Heat unvented Cylinder question

    Hi guys I am having my current cylinder replaced with a World Heat superflow indirect cylinde as im upgrading to solar thermal via a grant. I asked the supplier if they are replacing the immersion heating thermostat and the thermostat thats connects to the boiler and I was told if I want that...
  14. P

    Finding the order in which radiators heat up

    In order to find out the order in which radiators in the house heat up, would be possible to time the point at which heat is detected through either the flow or ruturn pipe on the radiator?
  15. I

    Plate Heat Exchanger - Correct orientation

    Hi all. Looking for an opinion; on the correct orientation of a plate heat exchanger. I had a discussion in passing about installing a plate heat exchanger on its back so that the connections are face up, standard orientation is that the platte exchanger sits on one end and the connections...
  16. B

    When my oil heating is on should it heat the water in my back boiler of open fire as well?

    When my oil heating is on should it be heating the water in my back boiler of open fire as well?
  17. Roy_66

    Hydrogen Boilers, Heat Pumps, Funny Cylinders etc. etc.

    Some positive news. For anyone not seen, interesting video from Roger B. on the future for boilers vs heat pumps etc. etc. Includes some more slightly wacky but interesting points like horizontal cylinders and boilers - anyone done one / seen one on hol ? Was interested also that their...
  18. S

    Air to water heat pump with ufh, how many zones?

    Hi, For a small house (100m2) with and air to water heat pump and underfloor heating, how many thermostatically controlled heating zones would you recommend? There are 3 no. bedrooms, a bathroom, hall, sitting room and kitchen/dining room. The house will be rented out so providing a zone for...
  19. F

    Downstairs rads taking ages to heat

    Hi there I’m brand new to this forum and really need some help. my downstairs radiators can take an age to heat up. Sometimes they just don’t heat up at all. Other times they do heat up and all is good. Until I turn the heating down at night and the issues begins again the next morning. A...
  20. E

    Blocked Heat Exchanger?

    The central heating system (Valliant Ecomax 622, 8 large double radiators) had been losing pressure for several months and I'd been topping it up every other day during the cold periods, but it hardly needed it when the heating was off for a while. The radiators had been making 'tinkling' sounds...

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