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hot water cylinder

A hot water storage tank (also called a hot water tank, thermal storage tank, hot water thermal storage unit, heat storage tank and hot water cylinder) is a water tank used for storing hot water for space heating or domestic use.
Water is a convenient heat storage medium because it has a high specific heat capacity. This means, compared to other substances, it can store more heat per unit of weight. Water is non-toxic and low cost.
An efficiently insulated tank can retain stored heat for days, reducing fuel costs. Hot water tanks may have a built-in gas or oil burner system, electric immersion heaters. Some types use an external heat exchanger such as a central heating system, or heated water from another energy source. The most typical, in the domestic context, is a fossil-fuel burner, electric immersion elements, or a district heating scheme.Water heaters for washing, bathing, or laundry have thermostat controls to regulate the temperature, in the range of 40 to 60 °C (104 to 140 °F), and are connected to the domestic cold water supply.
Where the local water supply has a high content of dissolved minerals such as limestone, heating the water causes the minerals to precipitate in the tank (scaling). A tank may develop leaks due to corrosion after only a few years, a problem exacerbated by dissolved oxygen in the water which accelerates corrosion of both tank and fittings.

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  1. H

    Hot water cylinder only heating top half of tank

    Hiya, we had a new pressurised hot water cylinder fitted a few weeks ago even though its double the size of our last one we are finding we aren't getting any more hot water. So once the tank is full and the immersion has turned off and i touch the tank only the top half feels warm and the bottom...
  2. M

    Leaking drain valve on Hot water cylinder. Advise please

    Hi All, I have a leaking drain valve off the CW inlet on a Range Cylinder. Am I right in thinking I have to empty the Cylinder below the CW inlet to change the valve? To isolate cold water to the tank to prevent refill, should I just lock off the 1 stop CW inlet or all 3 red stops? Turn mains...
  3. david montgomery

    Hot water tank in a flat has poor flow rate after refurbishment.

    Good morning everyone. My parent had a new kitchen and bathroom fitted in her flat 2 years ago and has only now told me that the hot water flow to both hot taps is really poor. it wasn't like this before. its a flat with a 1075x450 IND BS combi HW tank. she says that the tank was drained down...
  4. H

    Sizing a cylinder for 9 bathrooms

    Sizing an indirect H/W cylinder. What size of H/W cylinder would I need for a property with 9 bathrooms?
  5. Bookalon

    hot water cylinder control valve

    Hi, I have an oil burner which is controlled via Tado to heat my home. My hot water cylinder is heated with water from the burner and also has a dumb immersion. I don’t use the immersion at all And would like to replace it. The burner heats the water in my hot water cylinder with a TRV valve...
  6. D

    install combi boiler and pressurised hot water cylinder

    Hello, looking for a heating engineer to recommend / install a pressurised cylinder and combi boiler system. There is ufh for a living space and two bathrooms, and radiators for the rest of the house. It's a 3 bed 2 bathroom property with solar panels on the roof, located in ringwood bh24. Any...
  7. C

    Should I be worried about this installation ?

    I have just had 2 new vented hot water cylinders installed by a plumber (not yet finished) however I am a little concerned as the pipes are not attached to anything, the empty tank on the left wobbles a little on uneven floor and is slightly on the wonk. The plumber is really great but this was...
  8. C

    Horizontal hot water cylinder install. Does this look correct?

    Anyone out there able to help? Is this correct or are there things wrong and if so what?
  9. S

    Help diagnosing bubbling originating in hot water cylinder

    Hi there, I recently replaced a dead central heating pump in my home, so drained down the system completely, fitted new pump and filled up. What I'm experiencing now is a periodic bubbling noise, it starts in the hot water cylinder on the 1st floor and makes its way to the boiler on the ground...
  10. G

    Replace leaking hot water cylinder or change to combi boiler?

    Hi, In my 2 bedroom flat I have a Worcester Greenstar 24i boiler and a 200 litre Zip AquaFlow hot water cylinder. The hot water cylinder has started to slowly leak from the bottom and I think it will need completely replaced - quote to replace is around £1000. Given that this is only a 2...
  11. D

    Electric boiler and an unvented indirect hot water cylinder

    Hi, I have recently purchased a cottage with an LPG combi boiler (no mains gas in the area). I intend to replace this with an electric boiler and an unvented indirect hot water cylinder. The boiler will run four radiators and the hot water cylinder. The cottage has one bedroom. What size (kw)...
  12. E

    Leaking Unvented Hot Water Cylinder

    Hi, I've got an unvented hot water cylinder with a leaking pipe. The job is in a residential property in pontefract.
  13. E

    Renovation Issues - Hot toilet and extreme shower temps

    We've recently just moved into our recently renovated home and we've found out that we've got some interesting plumbing issues, the first one is that both the upstairs and downstairs toilets are hot (the cistern water is hot) and radiating through the toilet and wall (concealed cistern), and the...
  14. D

    Hive installation - dual zone heating with Combi boiler and hot water cylinder

    Hi all, At our old flat, we had a combi boiler which dealt with heating and hot water without an additional tank. There was an external timer next to the boiler, and a room thermostat (manual) in the hallway. I was able to replace the latter with a receiver and wireless (not smart) thermostat...
  15. C

    Using a vented hot water cylinder on an invented system

    Hi, Can you use a vented hot water cylinder on an unvented system? Many Thanks, Carl
  16. B

    URGENT unvented hot water cylinder in a roof space of a two storey house

    unvented hot water cylinder in a roof space of a two storey house in an existing property what is best option for discharge pipe to terminate.It will be 22mm copper but didn't want to run it all the way down the back of the house to ground level if possible.
  17. C

    What is the thread out of the top of a hot water cylinder?

    I want to fit a sussex flange to a standard hot water cylinder about 10 years old, normally there is a 1inch bsp tapping, this one has a male thread out of the top with a compression 28mm to 22 mm end feed reducer, held in place by a 28mm nut and olive, it does not have a male iron to copper...
  18. N

    Water cylinder re heat time

    Hello all, i am doing work for a customer who has asked me what the reheat time of a 250 litre cylinder is. To be honest after all the years of doing plumbing this is a question that i have never been asked before because usually if you need a hot water cylinder then it is what it is, you just...
  19. H

    Should I dpressurise hot water cylinder?

    I am closing up a property for 2-3 months and will be turning mains water off. Hot water is supplied by a pressurised water cylinder in the loft. Should I depressurise it before I leave the property? If so is it simply a matter of switching water off and run hot tap for a while? Any advice...
  20. D

    Has my hot water cylinder coil broke?

    Hi All, On Thursday there was a water leake a few steets away from us And we had no water most of the day. About 10 minutes before my neigbour said the water supply was back on I remember hearing a fair amount of activity from our airing cupboard. I took this as water/air moving through as the...
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