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hot water supply

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. P

    Isolating hot water supply - indirect unvented cylinder system

    Hello, I am fitting new taps and a shower mixer in my en-suite and was looking to isolate the hot water pipes. I have an unvented indirect heating system (have attached some photos). I was wondering if the isolation valve that would shut off the water to the hot water taps is as circled in the...
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    • Forum: DIY Plumbing Forum
  2. A

    Why poor hot water supply?

    Three years ago I decided to switch from an under floor gas warm air system to a modern radiator system. I had installed a Worcester Bosch 38CDI Classic Combi feeding eleven radiators of varying sizes. I live in a fairly large bungalow and whilst the heating side is acceptable I am very...
  3. N

    Kitchen Sink Mixer Taps Install.

    Just looking for some advice, I have just fitted a new kitchen sink and both water pressures are the same in hot and cold on the mixer tap, both connected to tap flexies with shut off valves, however when hot is turned on it is not turning on the hot water for the boiler, previous sink had...
  4. C

    Expansion vessel for potable water for a combi boiler

    Hi,a customer of mine has a combi boiler and they don't have an expansion vessel for the potable hot water supply. I know there's an expansion vessel for the closed-loop central heating circuit but I doubt the combi boiler has one for the potable water. I was thinking to put one in the airing...
  5. A

    Disappointed in hot water supply

    I had a new central heating system installed a year ago but whilst the radiators seem okay I am not happy with the hot water supply. I live in a bungalow so the boiler is on the same level as the radiators. When I turn on the hot water tap I have to run off what seems like at least a gallon of...
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  6. 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...
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  7. T

    Heating working, no hot water

    Hi, Your expertise would be appreciated on this issue: Heating is working fine upstairs and downstairs, boiler is firing no issue. However, when I switch on hot water on the programmer and turn up the thermostat on the cylinder the boiler fires and I can see the EPH motorised 2-port valve...
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  8. S

    Advise On Hot Water Supply To A Tennis Pavilion

    my local tennis club would like hot water to its pavilion, it’s only a smallish wooden clubhouse requiring hot water to two wash basins and a sink unit, floor to ceiling is only about seven feet high so no real head room for a gravity system, no gas available just basic electrics for sockets and...
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  9. H

    Why is the water pressure non existence for hot water supply to shower?

    We bought an Edwardian semi detached house just over a year ago (previously a hotel, converted in the mid 90s). The shower (not power or pumped) had low pressure for hot water which got worse over time, then out of nowhere (hadn’t got round to getting anyone to look at it) it was great, better...
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  10. K

    Pulsating hot water supply to shower

    Hi everyone - wondering if anyone can offer words of wisdom. I have a problem with the hot water supply to my shower. Its a bath mixer tap (compression washer type) with a shower head attachment - hot water is supplied by a combi boiler that also supplies 8 radiators. The central heating is...
  11. L

    Unable to turn off hot water supply to change taps

    We live in a flat spilt level flat, cold water has stopcock on each floor, water is heated by gas boiler then stored in immersion tank in airing cupboard. We have no main stopcock. We cannot determine where to turn off hot water. There is no valve at boiler. Pipes go into panelling from...
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    • Forum: Plumbing Jobs | The Job-board
  12. C

    Problem with hot water supply

    I should be really grateful if someone out there could please help me (and my daughter!) with the following problem. For the past few weeks, my daughter's hot water (from the bath and basin tap, I think) has been dwindling, to the point where there is almost no water coming out and she is very...
  13. B

    Hot Water Supply?

    I have a customer who is renovating a property. His main concern is that he will be able to run 3nos Raindance showers at the same time for 10mins, which equates to approx. 75 litres per min. I am looking into accumulators, break tanks and pumps to boost the cold water supply, but im unsure...
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  14. M

    Hot water supply - hair salon

    Been out to have a look at this one, all the property has is electricity and a cold water main. Hot water is required to feed two 'back wash' units. The idea of two independent electric showers is out of the picture because of the cosmetic design it would just not look too good. The salon kept...
  15. I

    Failed gate valve: how to stop hot water supply in flat?

    Hi, I need to replace the back nut on my hot bath tap. However, the gate valve on the cold water supply to the HWC seems to have failed and still allows a flow through the hot tap even when closed. I live in a flat, presumably with a shared cold water tank somewhere in the loft to which I don't...
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  16. R

    Any recommendation on Mains Hot Water Supply

    Any advice on a mains hot water cylinder without the need of discharge pipe. Have to replace one where there is no provision for discharge pipe. Have found one Gledhill BoilerMate BP Mains Pressure Hot Water Thermal Store Cylinder, are they any good. Any advice much appreciated.
  17. S

    Long hot water supply pipe run

    Hi, Currently on a job where the hot water tank is in the basement with a 20 meter run to the loft then drops to the bathrooms and takes at least 3 mins for the hot water to come through so trying to look at a way of fixing this. I have thought about a secondary circulation but I'm not that...
  18. R

    Re: Unvented Tank Hot Water Supply question

    Original thread closed? I was just wanting advise so if needed I can get a qualified person in to make any necessary changes. But I'm left a little confused as from one post stated it was normal to get a little pressure release when a hot tap is initially opened and this is normal operation for...
  19. R

    Unvented Tank Hot Water Supply question

    I had my vented hot water tank replaced with an unvented tank recently. The pipe work was altered and an expansion vessel fitted. Is it normal for the hot supply to release the contained pressure after cold water has been heated and expanded? This is more noticeable for example after a bath...
  20. B

    Ferrolli F30 Domestic hot water supply cuts out.

    Ferrolli F30 Domestic hot water cuts out?? Sirs,I have a Ferrolli F30 combi boiler. The domestic hot water supply from it goes cold about every minute for about 10 secs then heats up again, usually when in the shower.Annoying, but it may fail altogether eventually. This appears mainly when the...
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