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A thermal column (or thermal) is a column of rising air in the lower altitudes of Earth's atmosphere, a form of atmospheric updraft. Thermals are created by the uneven heating of Earth's surface from solar radiation, and are an example of convection, specifically atmospheric convection. The Sun warms the ground, which in turn warms the air directly above it. A thermal is a rising mass of buoyant air, a convective current in the atmosphere, that transfers heat energy vertically.

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  1. T

    Unused solar Thermal Thermal

    Morning, Does anybody know what happens to a solar thermal flat panels (a pair on south facing slate roof) that have been unused for at least 12 months possibly year before also. System has been switched of due to loss of pressure. How will last years heat wave conditions have effected the panel...
  2. davidw

    How thermal store boiler works?

    How a thermal store boiler works! I’ve got an old thermal store boiler and I’m trying to work out how it works. From what I understand the boiler keeps hot water at a steady temperature in the boiler whilst cold water enters into a coil which is held inside the hot water and this heats the cold...
  3. I

    Thermal Store Heating Up Cold Feed Pipe

    Hello, I have just installed a vented McDonald 250L thermal store, it is for multi fuel but currently just connected to a standard oil boiler in the garage which is fully pumped to the TS, the system has two pumps both basic 3speed Grunfoss, one on the boiler return and the other on the CH flow...
  4. B

    Solar Thermal Fluid Leak

    Hello My solar thermal system appears to be leaking fluid (pics attached). Could anyone give me an indication of what the issue is likely to be and the potential cost to rectify? The system was installed in May 2021 and has a flat plate panel on the roof. It works very well generally and...
  5. 1

    Solar thermal flow meter blocked

    Hi, Solar thermal not so big these days but a couple of Q for anyone who still works in it. Background. I'm an Electrician not a plumber.. I've been maintaining my otherwise excellent solar thermal (Original install MCS by Others), for the last ~ 18 years, over which time I've needed to clean...
    • 1justin
    • Thread
    • flow flow meter meter solar thermal
    • Replies: 2
    • Forum: Renewables
  6. L

    Thermal store question/query please

    Hi, I am getting my old hot water cylinder tank replaced (my property has no boiler as it is a full electric property). My plumber suggested changing to a thermal store. He is a competent plumber but are there any certificates that I need to ask for, is this notifiable work and would you...
  7. D

    Gledhill Boilermate SP150 Pre Plumbed Thermal Store

    Looking to have Gledhill Boilermate SP150 Pre Plumbed installed to replace current aging Systemate 2000. So looking for any advice / experience with this system as can not find any so far. Thanks
  8. B

    Thermal store pumping over from wood burner-recommendations requested

    I'm looking for help with an open vented central heating system that is pumping over. We have a thermal store that has two heat sources - gas central heating, and a wood burner - both feeds are pumped with a Wilo Smart A 25/4-130 circulation (one pump per feed). When the wood burner kicks in...
  9. D

    Solar thermal system labour and parts pricing

    As I recently had my HW cylinder replaced and we had to leave disconnected the solar thermal system from the HW cylinder and drained out the old glycol. What is involved in re-filling the thermal system with new glycol in terms of number of hours of labour and materials? I got a quote for a bit...
  10. C

    Gledhill PULSAcoil 180 Thermal Store - Feed & Expansion Arrangement

    According to the manufacturer's information OV PULSAcoil thermal stores are primarily designed for use with on/off peak electricity but also have two open pipe spigots (NO internal coil) for flow and return from an additional heat source e.g. a heat only boiler. The 180 store comes with a...
  11. M

    Connect air source heat pump to 2 UFH(unused)ports on a thermal store?

    Would it possible to connect an air source heat pump into 2 UFH (unused) ports on a thermal store? The property is heated by oil and a wood stove. I have the option to use the ports that are connected to the wood stove as using the heat pump would be a more efficient and a better priority, I...
  12. J

    Adding solar thermal to existing bosch combi idea.

    Hello, So I want to add a solar thermal system to my existing Worcester bosch greenstar but don't want to lose the functional benefits of the combi boiler. I'm proposing to install the solar collector on the side of the house in a position that will enable gravity flow to a 200litre tank just...
    • Jonnyo
    • Thread
    • bosch combi existing solar thermal
    • Replies: 8
    • Forum: Renewables
  13. Macaque321

    What are the disadvantages of a Boilermate Thermal Store?

    I'm renovating my house which has a standard Vaillant boiler and tank in the cellar, and a tank in the loft. The house will have 2 bathrooms, and is a largish Victorian house (3 floor, but bathrooms are on half landings, at 1.5 and 2.5). Will have UFH on ground floor I've had the lead main...
  14. J

    Thermal Store with DHW Coil

    Do thermal stores have the DHW coil mounted high up in the cylinder, nearly right at the top?. If so, and assuming a 300 litre store at 75C and if you draw off 100 litres of HW at 40C from cold at 6C do the whole contents of the store then fall, to 64C?. (63.8)
  15. N

    Thermal Store cylinder

    So...got called to this earlier on, the install looks a bitnof a mess but looking past that the system seems like quite a simple setup though i am failing to find a schematic for this particular type of thermal store where we have 4 immersers which all on would be producing 12kw and an open...
  16. D

    Thermal Actuator wiring

    Hi i am not a plumber, nor am I an electrician. Just recently purchased an underfloor heating thermal Actuator. The wiring is as follows, brown, blue, black, grey. The old actuator is red, red, yellow, yellow. can any one tell me what colour matches with what colour? Thanks
  17. davidw

    Flowmaster thermal store flowmax 180

    Hi, I've inherited a FlowMaster thermal store combination cylinder, and hoped that someone could tell me what temperature the stored water needs to be kept at? I've never had a thermal store before and would welcome any advicemany thanks, David
    • davidw
    • Thread
    • america store thermal thermal store usa
    • Replies: 1
    • Forum: USA
  18. F

    Combi-boiler plus Thermal heat store - problem and suitable replacement recommendation

    Hi, sorry to bother you all with this but I am really struggling to find a suitable combi-boiler replacement and a knowledgeable heating engineer to discuss options. Ive tried to note as much relevant details below - apologies if its too long or irrelevant. Any help most gratefully received...
    • fastpatjo
    • Thread
    • america heat plus problem recommendation replacement store suitable thermal usa
    • Replies: 2
    • Forum: USA
  19. S

    Heating hot water only after solar thermal install.

    I had solar thermal installed recently, the system is a viessmann and goes with our viessmann boiler. The controls are on the boiler, seems to work well. I spoke to viessmann technical after the install and they and the install advised to change the water heating from the boiler to only come on...
    • spacey3
    • Thread
    • after heating hot hot water install solar thermal water
    • Replies: 8
    • Forum: Renewables
  20. C

    Pump constant pressure or proportional to the thermal output

    Hi I have a worcester boiler and one of the settings is 3-d1 (Pump range map) as attachment below Now the installer has set it away from the default of 250mbar to proportional to the thermal output and also changed 3-d3 to 30%. The issue I now have is that with the zones fully open then...
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