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MARKAL is a numerical model used to carry out economic analysis of different energy related systems at the country level to represent its evolution over a period of usually of 40–50 years. The word MARKAL was generated by concatenating two words (MARKet and ALlocation). Various parameters such as energy costs, plant costs, plant performances, building performance and so on, can be input and the software will choose an optimal technology mix to meet that demand at minimum cost. It is available from the International Energy Agency. TIMES is an evolution of MARKAL and both energy models share many similarities.

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  1. U

    Washing machine struggles to drain

    Hi people! Quick question. I hae moved my washing machine into the room next to the kitchen. I have drill a core into the wall and run the infeed and waste hose from the machine to under the sink but the machine struggles to drain. Have only run it a few times and at times it struggles/won't...
  2. N

    voi9ler repair price guidance

    Am looking for price guidance for the work as per below scope to fix heating/hot water on a system boiler (was quoted 900 excluding materials that sounds a lot...). Thanks. -Drain down the central heating system. - Fit two port zone valves to controlhot water and central heating circuit...
  3. B

    problem with boiler kicking in when cold taps turned off!

    Hi All, I would really appreciate some help/advise with aboiler problem I am having. I have a valiant eco tec combi boiler and have noticed thatwhenever I flush the toilet downstairs, as soon as its finished filling theboiler kicks in…. the orange light turnson and I can hear the flame ignite...
  4. I

    which protector?

    Hi, I’d be grateful for advice on which system protector to usein my central heating. I’ve got a combi boiler with nine radiators and no tankson the system. I’ve seen the Fernox F1 500ml in Screwfix. Is this the rightstuff? Thanks
  5. Z

    Tristor thermal store banging like train!

    Hi, I have a Tristor Telford thermal store in my flat and recently, it's started it make such loud banging noises, it sounds like a car crash pr someone busy banging on the inside! It will make these noises when the system is turned off (as there is no timer) at least 4 or 5 times an hour at...
  6. U

    Tristor thermal store banging like train!

    Hi, I have a Tristor Telford thermal store in my flat and recently, it's started it make such loud banging noises, it sounds like a car crash! It will make these noises when the system is turned off (as there is no timer) at least 4 or 5 times an hour at all times of the day, when it's...
  7. S

    Advise needed for career change to plumbing sorry probably seen this a million times

    Hi I'm new to the forum and have recently decided to retrain as a plumber. For the last 15 years I've been welding and fabricating which has included pipe work. Also as part of my job I've installed utility pipe work in industrial buildings with solid jointing, crimping and threaded in all...
  8. P

    Shower Pump Not Always Starting - How To Test Flow Rate?

    My daughter has a pumped shower that doesn’t always start without a bit of fiddling. I think the problem is lack of head. How can I test the flow that’s available when pump off, as I believe that the newish Salamander pump needs a min. of 2L per min? Do I test from the shower head end of shower...
  9. S

    Whole building with water pressure/hot water problems at peak times

    Hello plumbers! I hope someone can shed some light on this please. I live in a Victorian building with four flats. Three out of the four have reported problems with lack of hot water at peak times, 7am to 9am ish. The fourth flat may do but we haven't heard from them in the subject. We all...
  10. P

    Mira Power Shower Pump squeek - anyting to be done?

    Hi everyone, I have a Mira Enduro "Universal" 1.5 bar double ended pump. the wife turned on the shower this morning and nothing happened (she had a shower with no power). I am tasked with troubleshooting and have read the appropriate guide. When I tried the shower it worked fine a...
  11. D

    Ground workers doing a top job again

    Think that might leak :|
  12. D

    boiler losing pressure

    Hiya We live in a new build, 3 year old house and have an ideal logic boiler, obviously 3 years old too. over the last 5 weeks it has lost pressure 12 times and have had to re pressurise the system ourselves. the first time sse came to inspect they re pressurised the system and checked...
  13. A

    OV system banging noise at boiler. Happened a few times, likely cause?

    Hi guys as above really, been to a couple of jobs where there has been a banging noise at the boiler on an OV system. everything is circulating ok and getting hot but occasionally there's a banging noise coming from the boiler. What can cause this? muck in the system? Struggling pump? Thanks
  14. S

    Help wanted Ideal icos boiler probem

    Hi all thisis my first posting and need help. I have anIdeal Icos HE18 boiler, the other day the heating did not come on and afterinspection of the boiler. On the control panel it was flashing a code of L.F Accordingto the service manual it is a flame detection electrode fault to which...
  15. M

    Cylinder making a racket.

    Recently we have been having problems with our boiler (council) They have been out around 6-9 times in 3 weeks replacing new parts and a new pcb board. They have also replaced something in the cylinder cupboard but not exactly sure what. When the CH is on FULL, there is a loud noise coming from...
  16. F

    3 way valve manual setting

    I have recently moved into a house that has hot water underfloorheating . Upstairs there are radiators with thermostats. The underfloor heatngsystem has an outside temperature sensor and a 3 way valve. There was no room thermostat on the groundfloor and so I had one installed. OK so now the...
  17. H

    Worcester Junior 28i (programming setup)

    I hope you can help. I am not a plumber and have very limited knowledge of central heating. I have the above boiler and the mechanical programmer has failed (I swapped this about 3 years ago as the previous one also failed). The boiler provides hot water where needed and also provides...
  18. J

    Please help! Boiler loosing pressure! But only when the heating is on?

    Hiall. We have anARISTON Combi A Series boiler situated in our loft. The last number of years wehave had a number of instances where it has either cut out for no apparentreason or lost pressure. The cut outsare very infrequent and so are not at this time a concern. The pressure losshowever...
  19. M

    Plumbing merchants opening times

    Just had a repair on an Worcester- new divertor valve needed. There's three national merchants in the town I'm working at yet everyone is shut at 12 on a Saturday the lazy arses. It's also £20 more than I can get it delivered to my door, very tempted to just let the customer wait an extra day...
  20. C

    Pumping from thermal store, connections, flow rates, storage and recovery times

    Hello all, I have been a member for a while but fresh to posting. I am a plumber with 5yrs experience, qualifications in hot and cold water and licences unvented for your info. This is the first time I have come across this type of setup in a house so require advice on my action plan. The type...
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