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heats

Latent heat (also known as latent energy or heat of transformation) is energy released or absorbed, by a body or a thermodynamic system, during a constant-temperature process — usually a first-order phase transition.
Latent heat can be understood as energy in hidden form which is supplied or extracted to change the state of a substance without changing its temperature. Examples are latent heat of fusion and latent heat of vaporization involved in phase changes, i.e. a substance condensing or vaporizing at a specified temperature and pressure.The term was introduced around 1762 by British chemist Joseph Black. It is derived from the Latin latere (to lie hidden). Black used the term in the context of calorimetry where a heat transfer caused a volume change in a body while its temperature was constant.
In contrast to latent heat, sensible heat is energy transferred as heat, with a resultant temperature change in a body.

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  1. Y

    HW only heats when CH is also active... but actuator is good

    Hi All, I have a really weird (to me) issue/feature in a house we've just moved into. The CH and the HW work perfectly fine when they are both active. That is, when both are switched on at the control unit. However, if I switch the CH off but leave the HW on, the water doesn't heat. The boiler...
  2. A

    Combi Boiler heats radiators when hot water only is selected.

    My combi boiler has started heating the radiators when I select hot water only. Any ideas ? The system has been in for maybe 10 years.
  3. D

    Boiler over heats and turns off

    Hi everyone. I have the old style boiler, basically last year it started not working after being on for 10 mins.. Replaced the pump and 3 way port valve cleared the lines, bled everything, cleaned it all out Etc. Literally done most things. Basically it will work bit o my if I manually position...
  4. P

    2 zone CH but 1 zone heats whole house

    I’d really appreciate some advice. We moved into a new build 3 story town house last Monday. It’s got a Worcester boiler & 2 wireless thermostats (one by the front door, the other on the first floor landing). When the downstairs thermostat asks for heat (to warm up the kitchen & lounge) every...
  5. L

    Ideal logic 24 + heats radiators once then stops shows no fault !

    Hi all Looking for some help please! It concerns an ideal logic plus 24 combi. When you switch the central heating on it fires up fine. All the radiators get up to temperature. It then stops and the radiators cool down. All good! They do not come back on, even when the room is noticeably...
  6. L

    Gerkros Oil Fired condensing boiler heats water only

    Hi all, I have a gerkros oil fired, high efficiency condensing boiler with a Riello burner. The issue we have at the moment is that it heats water only when the control panel is set to Hot water only. When we set it to central heating and hot water it won't heat either? I believe the maker is...
  7. Inverness

    greenstar heats lave external combi 18/25 went to lock out why??

    hello went round to my sisters new house less than 4 years old and the heating system is new too. i am struggling to understand why it went to lock out? i pressed the lockout reset button and now everything is running as it should be. the boiler has been running for over a week fine with no...
  8. L

    Boiler Constantly Heats CH

    Hi, I am having an issue with my Flexicom 24cx boiler working with my CH. Whenever I want my heating on, I set the burn temp to around 75C. The room will reach the desired temperature but instead of the boiler knocking off, it constantly heats and makes the room hotter than desired...
  9. N

    Zoning

    Hi, Recently my gas-fired central heating system was updated to two zones each operated by its own programmable Honeywell thermostat , 1) main house & 2) annex. Both work except the one heats up the rads on both sides, the other heats up only his own side. Can you please explain what would...
  10. J

    One Radiator Not Playing Ball?

    Hello, Currently trying to get some mucky rads sorted, all done with no drama, however........ I have a double in the living room, that, I've flushed twice, and it's the only one not heating properly? I did it yesterday, and again this morning, but the same thing happens, heats a bit on the...
  11. B

    Radiator never properly heats up

    RADIATOR NEVER FULLY HEATS UP I have a 10 year old Worcester Bosch 30 HE combi boiler, serviced each year by Worcester Bosch. There are 6 radiators - all modest size - and a bathroom towel rail on the system, in a standard size non-extended 3 bedroom 1930’s semi. My Hall radiator – the last...
  12. Robert Tyrrell

    Heats lave 12/14 Burner problems

    Got called to a breakdown, went through the process of isolating the problem and found the burner motor to be the problem; volt pen lights up at the connection to the wiring but the fan doesn't turn and it goes to lockout. Problem is finding the replacement motor as it's old. Parts Centre have...
  13. W

    Combi Boiler - Potterton Puma 100e - Fluctuating temperature

    Hi guys, Over the last few months I noticed that the hot water temperature in the shower has been fluctuating from very hot to stone cold every few minutes. Thought it was the thermostatic shower control but decided to check the boiler first. Boiler pressure is 1.5bar, mains cold water supply...
  14. W

    Turning on Hot Water heats up the Radiators?

    Hi there, I recently come across a problem where by a customer's radiators were heating up when he turned the boiler to 'hot water' only. The central heating is off, but it still heats up the rads. The boiler is one of those combination things where the boiler has it's own integral...
  15. N

    Hot water tank heats up when we only have the heating on

    Hello, We are having problems with our archaic back boiler heating and ho****er. Before we payout hundreds for a plumbers I thought I would ask on here.... Basically the system is very old, a baxi back boiler.Recently the hot water tank has started to heatup when we only have the heating...
  16. E

    help needed please

    hi i wanted to know if this was normal or something is not working. i have a valliant boiler and when it heats up to the set temp. lets just say 60 then the boiler cuts off and temp quickly drops to 48 and then kicks back in. Is that normal or is something just not working. ?
  17. D

    No heats from radiators in first floor

    Hi All I just installed new combi boiler after decommission an old back boiler I capped the flow and return connections and which were in fire place. I picked the flow and return from the radiators in kitchen close to the boiler when I commissioned the new boiler I had no heat up stairs should I...
  18. S

    Icos Ideal HE24 heats the hot water and only slightly heats the central heating

    Hi My problem is that I have hot water but no central heating (although the central heating does get slightly warm but only for a short while and not enough heat to warm a room let alone heat it) I have an Ideal Icos boiler (sealed system I think it's known as). The programmer is a Honeywell...
  19. M

    Vokera heats up for 2 hrs and then switches off and won't come back on?

    Hi I got called to a vokera combi boiler the other day where it had turned off after heating up the house and would not come back on again. So I turned it off at the plug, turned it on again and it all worked fine. So, I said if it ever cuts out again just do this. Well I have just had a call...
  20. G

    Little help please?

    Got a call customer has no hot water. So turn up they tell me the potterton prima f60 had been making a noise and over heating. They had been resetting the over heat. But it only happens on hot water. So I pop upstairs to find a sticking Drayton 3 port. I swap that to a Honeywell and all is...
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