If you wish to purchase a thermal store cylinder to install it yourself, get in touch
Types of water heaters...
Conventional cylinders (hot water tanks) are vented cylinders. However, they only
provide hot water under gravity pressure or from a pump (see our main page HERE).
For a much better hot water system, mains-pressure water is now provided in virtually
all new homes. There are two competing systems (apart from combi boilers). These
Unvented heat bank and vented Thermal Store
Both have advantages and disadvantages, and they work differently...
This is an unvented heat bank. The one on the right is a electrically-heated version.
The one on the left is heated by a boiler. An unvented heat bank is popular with
installers as it is relatively cheap to purchase. However, due to safety implications,
it must be installed and serviced by a ‘G3’ accredited engineer. An unvented heat
bank ‘banks’ the heated water for later use. As the name suggests, it is not vented
and thus is pressurised. It therefore requires a pressure release valve - and is
part of the reason why it must be serviced annually by a G3 accredited engineer.
This can make the cylinder a bit more expensive to own. Also, when an unvented heat
bank suffers from limescale, it doesn’t show until it’s far too late to do anything
about it. The cylinder has therefore come to the end of its life. This can happen
in as little as 10 years. With a replacement cost of £1,800 it would mean an annual
cost of £180 to be added to servicing and maintenance!
This is a simplified drawing of a vented thermal store. It is slightly more expensive
to purchase compared to an unvented heat bank, and is thus not as appealing to installers
(quotations for install costs would be higher). However, it requires no annual servicing.
A vented thermal store is not pressurised, and is usually fed with water from a storage
tank that sits on top. This merely keeps the cylinder full of water which heats up
and acts as a store of heat (‘thermal store’). When a tap is turned on, the water
passes through the coil and picks up heat as it traverses the coil. It requires no
pressure release valve, but it does need a thermostatic mixer valve to function.
When a thermal store suffers from limescale, flow is restricted through the coil.
This is evident, and the coil can easily be descaled for around 1/6th of the cost
of replacing it. Thermal stores over 30 years old are sometimes seen.
We ONLY recommend vented thermal stores. Their advantages over an unvented heat bank
outweigh a cheaper install cost, as long-term they are a cheaper way to provide hot
We use high-quality British
products wherever possible
The Electric Boiler Engineers
We are at 19 Cockney Hill, Reading. RG30 4HF
Call or text us on 0770 231 6157**
Or email us - email@example.com
With regard to thermal store systems, the provided hot water flow depends entirely
on your mains pressure supply. We can assess your flow free of charge in the RG postcode
area. 20 litres per minute is recommended by us to be sufficient for a considerable
hot water supply without being unnecessarily wasteful. Systems are limited at 3 bar
pressure. If you currently don’t have a mains-pressure cylinder installed, and your
current pipes are fed by a water tank in the loft-space, they would be subject to
a 3-bar pressure when converted to carry mains-pressure water. We cannot be held
liable for their integrity. Full limescale protection can be provided by a Scalgon
LimeStop 800 at £75 - please see www.limestop.co.uk. This will give you GUARANTEED
and unrivalled limescale protection for two years. After that time it should be replaced
- current price £75. Capacity of mains-pressure thermal store hot water system in
prices quoted is 160 litres. You may require overflow protection (extra cost) if
your current heater is not protected, but this is your choice. Alternatively, purchase
a water-leak detector for less than £10 together with a drip tray. We back up our
installation with a 5-year guarantee and ‘within 24-hours’ call-out protection. An
annual check may be required to validate a manufacturer’s 10-year guarantee on some
thermal store cylinders. A deposit of 50% is required five days before work commences
– balance on completion. Free, no obligation quotations provided. If you choose us,
you will be provided with a binding contract, and your rights as a consumer are respected
and adhered to. You have the right to cancel your contract. Terms & conditions apply
- set out on your contract.
*There may be additional charges if we have to arrange hired labour to lift your
current cylinder out, and the new one in. Price includes a fitted plug to an electrical
socket. There is a small extra charge if we have to ‘wire-in’ the electrical supplies.
Mobile phone rates apply when contacting us by phone.
Prices correct as of last website update - December 1st 2022 - and are subject to