A system is a set of interacting or interdependent component parts forming a complex or intricate whole. Every system is delineated by its spatial and temporal boundaries, surrounded and influenced by its environment, described by its structure and purpose and expressed in its functioning.
Alternatively, and usually in the context of complex social systems, the term is used to describe the set of rules that govern structure or behavior.

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  1. Z

    Does this system need a bypass valve ?

    Visited a friend's house after an extension has been built. Part of this was relocating the boiler and controls. The system was converted from a gravity fed hot water and pumped heating to an S Plan system. They had said that they had a problem with the hot water heating when heating was...
  2. A

    Unvented System vs Combi Boiler

    Hi folks, new member to the forum here. Me and my wife are in a bit of a dilemma with our hot water/heating system we currently have. We are planning to do a kitchen extension at the back of the property (currently the kitchen is at the front, with the boiler in a cupboard), + add one more...
  3. N

    Boiler pressure near 3. How to depressurise boiler system with no bleed key?!

    Hi all, Earlier this week I tried to top up pressure in my boiler. The screws that allow me to do this are buggered but turns out I must have been able to turn it without realising. The pressure has gone up slowly from near zero to near 3! Now I can't turn the screw a particular way. I have no...
  4. R

    How is air getting into system?

    Just recently, our system seems to be taking in air, and getting very noisy around 6am when the water heating starts. Less noticeable when the CH is also on. It's a 25 year old reasonably small system with a gas boiler (replaced about 10 years ago) downstairs in the kitchen, the pump and...
  5. C

    Do I have to bleed air out of the water in the boiler?

    Hi.Drained the system today after running for a week or so with radiator flush in. Turned water supply back on but,stupidly only bled upstairs radiators...Now system is not getting warm and boiler only kicks in for short stints. Bled complete system and opened valve by the 3 way / pump.lots of...
  6. S

    Problems with hot water on a gravity fed system.

    Asking for a neighbour. He has an old style gravity fed heating system with tank and immersion heater. He has just changed the pump and three way valve actuator. His heating works but if he selects hot water it turns the heating off. Any suggestions would be appreciated, thank you.
  7. J

    Hello and help with a microbore system!

    Hello everyone, I have just moved into a 4 bed house which needs a bit of doing up, the heating/hot water is my main concern. The house was built in 1985 and has microbore for the central heating and some of the rads don't get hot. The boiler is an ideal HE24 fitted in 2007 which is in the...
  8. G

    Advice on replacement Towel Rad on Gravity System heated by Multifuel Stove

    Hello, My current installation is an 8Kw Morso Stove, about 20 years old, connected to: An indirect coil in a vented cylinder (on the ground floor where the heater is, but raised by about 80cm), gravity fed with a bathroom towel rail upstairs also gravity fed. Once the gravity circuit is up...
  9. Dan

    Warning system now in place - automatic account restrictions for wasting Moderators time

    I've setup the warning system to take the pressure off of staff. Get a warning for wasting the time of staff by replying with more smarmy remarks or whatever and your account will have restrictions applied. Staff can and will reply to one post and give a verbal warning / correction. No...
  10. S

    Unvented system services

    Hi, I've moved into a flat which has an unvented hot water system and have been told by 3 different plumbers (only 1 has g3) that there's no need to service it. Is this correct? I've also just noticed water leaking from underneath the expansion tank and been told this isn't a serviceable part so...
  11. Crooksy88

    15mm to 10mm on CH system

    I currently have a central heating system with 15 mm pipework running up through the floorboards to the radiators. I would like to convert the 15 mm pipe to 10 mm pipe underneath each radiator and run the 10 mm pipe up the wall behind the radiator. Basically so I don’t see pipework coming up...
  12. P

    Hot water not getting into heating system

    Hello, I am look some advice. Our boiler heats the water for the radiators, but the hot water only makes it as far as this component ( pump is above it). It has a temperature sensor in it reading air temperature in the void, but I think it must have a cross over in it from the central heating...
  13. J

    Extending heating system

    Hi. My first post and I am not a professionel just a retired engineer and a keen diyer so please bear with me if I get some terminology wrong. We are in the process of adding an extension to our house. Two floors. I am going to need to extend the heating system and am wondering what I should be...
  14. A

    wilo cc booster pump system

    Hi, Does anyone have the password to access the 'wilo -service' user access level on a Wilo CC booster pump set? Thanks.
  15. tonyt

    Vented system - Expansion / fill pipe or pipes?

    Hi, I'm coming to the brainy forum for a proper answer! Scene - vented system, was originally gravity with Aga, then oil boiler with integral pump, then new oil boiler last year with fully pumped "Y" system. I have problems with air in radiators. I find there is a single 22mm expansion/fill...
  16. Q

    Ideal Logic System 24 - F1 error - No idea how to re pressure

    Hello everyone, a friend of mine has recently had a F1 error on their boiler (Ideal Logic System 24). We have looked up what to do and it looks like we need to increase the pressure on the boiler. Seems simple enough. but with the way this was installed we don't know how to do that. we looked up...
  17. S

    System Boiler Advice required, please help!

    Hi All. I am refurbishing a house i recently bought. It would have 4 shower rooms and 6 vanity units in the bed rooms plus kitchen tap and a tap in utility room plus if i conver the loft into living space it need to be future proof to add one more shower room. Total radiators would be 16-17 in...
  18. L

    Am I ok to install a shower mixer myself on an unvented system?

    Hello... My ancient manual shower valve is acting up so I'm looking to replace it, thinking of using a thermostatic bar valve to do so which seems a straight forward enough job. However... I'm aware that my system is an unvented indirect solution and I'm nervous to touch anything that may...
  19. R

    Need help bleeding system

    Can anyone help me bleed my heating system as I am stumped
  20. M

    Pumped shower on solar system

    Hi, just taken over a bungalow that has a conventional water cylinder downstairs, vented to a cold tank in the attic, and also it had a roof mounted solar hot water system with hot cylinders up there as well. A Drayton electric 3 way valve selects which cylinder system supplies the hot water for...
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