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A power supply is an electrical device that supplies electric power to an electrical load. The main purpose of a power supply is to convert electric current from a source to the correct voltage, current, and frequency to power the load. As a result, power supplies are sometimes referred to as electric power converters. Some power supplies are separate standalone pieces of equipment, while others are built into the load appliances that they power. Examples of the latter include power supplies found in desktop computers and consumer electronics devices. Other functions that power supplies may perform include limiting the current drawn by the load to safe levels, shutting off the current in the event of an electrical fault, power conditioning to prevent electronic noise or voltage surges on the input from reaching the load, power-factor correction, and storing energy so it can continue to power the load in the event of a temporary interruption in the source power (uninterruptible power supply).
All power supplies have a power input connection, which receives energy in the form of electric current from a source, and one or more power output or rail connections that deliver current to the load. The source power may come from the electric power grid, such as an electrical outlet, energy storage devices such as batteries or fuel cells, generators or alternators, solar power converters, or another power supply. The input and output are usually hardwired circuit connections, though some power supplies employ wireless energy transfer to power their loads without wired connections. Some power supplies have other types of inputs and outputs as well, for functions such as external monitoring and control.

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  1. C

    What is the difference between a thermostatic and manual power shower?

    Hi, I am not a plumber, I'm a customer looking to replace my existing Mira Go Power (Manual) shower and will hire a plumber to install it. I don't understand technical plumbing terminology. What is the difference between (for instance) the Mira Vigor manual and the Mira Vigor thermostatic...
  2. J

    Pump running but no power to boiler

    On a breakdown which is stumping me. The boiler has no power to it even though everything else in the system is working as it should. The 3 way moves across when it should and kicks in the pump but there is no power on the wire entering the boiler.
  3. M

    Power flush & system corrosion

    In December 2022 (i.e. 5 months ago) I had a full system power flush conducted. Now the previously clear UFH flow gauges are black again. Is it possible that enough internal corrosion could have occurred in this time period? I had a separate plumber out a month ago to test some pipework and he...
  4. J

    Grant Vortex Blue no power to CH pump

    Hi, I have an issue with my Grant Vortex internal combi boiler. Specifically the electrical side. Everything was working fine (with a dual channel Hive system) but then the central hearing stopped working. When looking it seemed like there were a number of loose contacts as when we moved the...
  5. C

    Satchwell 5 2 port power on power off valve

    Hi first time poster, My elderly Aunts bungalows heating system, Ideal e type cf floor mounted boiler, yes I know it's ancient however she steadfastly refuses to have it changed even when offered a free boiler grant. Long and short her hot water is now getting boiling hot, I suspect its either...
  6. S

    does the power switch to the cylinder need to be left on ?

    Hello i have a 300l centre store unvented indirect cylinder. does the power need to be left on for this ? is it left on to keep water at temperature all day ? for a previous system i had a power switch for the immerison heater that was only turned on in an emergency thanks
  7. M

    How to fix power connector to boiler?

    Hey. Got home from Christmas with family to find boiler isn't working, no lights on anywhere. Boiler itself is old but ok. There has been a leak from an upstairs flat and the grey square connector in picture is very wet. Nothing has tripped on main board...I'm guessing either the connector...
  8. T

    power off no lights showing

    hi all , had a strange one this morning, boiler just went off ,dead no lights nothing. checked electric no power cuts everything else on in house, tools out then first checked power to spur , on, checked power from spur, on , switched off at spur removed cover to boiler (intergas 24/28) ,pulled...
  9. J

    Radiators top half hot & bottom half cold/warm---to do power flush?

    Hi all, I had my new boiler and 13 radiators installed in July last year, but since installed all the radiators always top half hot and bottom half cold or warm. I know that if radiators top half hot bottom half cold/warm, it indicates there's sludge in the system. But as the radiators were all...
  10. T

    Alpha boiler power cut

    Had a power cut now alpha gas saver 34c boiler is dead. Any ideas please
  11. CorgiDirect

    Kamco CF40 & CF90 Power Flush Machines Now In Stock !

    Kamco CF40 & CF90 Power Flush Machines Now in Stock! Due to Popular Demand. Order Today While Stock Lasts Power Flush Machines - CorgiDirect - https://corgi-direct.com/power-flush-machines-18089-0000
  12. R

    Using gas when power is off

    We recently had a power cut for 3 days and when it came back on I thought I would have a look at the smart meter. As expected I had 2 full days of no use of electricity. However when I went to look at my gas usage it looked almost normal usage during the whole period. Gas in my house only...
  13. GeoffG1

    Y plan provides HW & CH irrespective of request, turn of the power and

    I have replaced a danfoss timer /switch on a older system to a Drayton LP522 which consist of a hot water cylinder (heater not working) with a cylinder stat. A Honeywell y plan 3 port, a pump and a back boiler but no thermostat. I have checked and checked the wiring and all seems correct...
  14. N

    replacement model for a Redring Expressions 520TS power shower

    Hi chaps - can anyone recommend a replacement for the above? keeping it as simple as possible please....hot and cold inlets are on tight side as is the cable....cheers Dave
  15. P

    Power Flush after visit

    Hi I have recently had a visit from an engineer as I am covered under a homecare agreement I've had for around 18 years. This was for a leaky draincock valve. When I asked them to add inhibitor due to advice I received on this forum he said he would but then pulled out a pipe clogged with...
  16. R

    Electric power shower

    Could anybody advise me on which power shower to buy for a mains water fed low pressure system preferably with its own built in pump , not sure of the electric power in the 1 that’s in use at the minute , don’t mind paying for a really good power shower Many thanks
  17. G

    Can I disable the pump on a power shower?

    Hi, I have a Mira GoPower in a bathroom. I'm getting my system upgraded to unvented with an accuboost pumped cylinder. Whilst I am planning a bathroom refurb (new tiles, tray, enclosure, mixer etc), can I turn off the power element to the shower and use it as a straightforward mixer on a...
  18. T

    Chemical and/or Power Flush?

    Some more plumbing advice, please. I am getting a new boiler installed and this includes a Hot and Cold Chemical Flush of the system. Do I also need a Power Flush or is the Chemical Flush sufficient?
  19. C

    Weather cutting out Biassi and power flushing question

    Hi, would appreciate any thoughts/best suggestions with this. I have an 8 year old Biassi Riva Plus HE 28 Combi in the garage. Its had a few issues this past year but generally works well . Thinking of either fixing its existing 2 issues or replacing it with a new one. Prefer the former . The 2...
  20. 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...
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