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Unvented pressurised water cylinders
Talk to Greenvision - award-winning, national independent water cylinder installers
Why upgrade your old water cylinder to an unvented pressurised water cylinder?
Installing a low energy consumption hot water cylinder can significantly reduce your energy bill, improve bath filling times, increase shower pressure and increase and free up value space in your airing cupboard or bathroom as they can be installed in lofts, garages and utility rooms. Also, you may have a tank which is to big or to small, heating more water than you need or running out of water because the tank is too small.
Heating hot water can account for over 50% of your energy consumption so choosing the right hot water cylinder can save you £100s per year. We offer a range of low-energy consumption electric hot water cylinders for you or your business.
Our hot water cylinders are incredibly well insulated and have an extremely accurate thermostat which means less temperature variation. Less temperature variation means less energy used. They are also designed to take advantage of economy 7 tariffs & renewable energy sources and are complete silent.
We offer a free consultation to understand your requirements, we can guide you through different options, and answer any questions, a free survey and hassle free installation service. Whether you are a homeowner, landlord or social housing provider sit back and relax with our award-wining installation service.
We are Which Approved Installers and EDF Energy exclusively uses Greenvision for all their high heat retention storage heater installations.
The benefits of unvented water cylinders
Five things to consider when upgrading your water cylinder
Only company with plumbers that hold a G3 certification can install or maintain an unvented cylinder.
As with any major changes to your home it is vital to do plenty of research and talk to the experts about your requirements.
Make sure you know what you want to get out of your new system. Greenvision will be able to offer advice on the best option for your needs and budget.
What type of cylinder should I install?
Think about your type of property and your requirements e.g. if you are in a mid floor flat with no loft access and your cylinder is positioned in the centre of your flat it may be difficult to install an unvented cylinder. A thermal store may be a better option as there is no need for additional pipework. Greenvision can advise on this.
Greenvision will guide you through the minefield of different heating options and answer any questions you may have. We believe knowledge is power and helps you make the right decisions. That's why one of the largest energy companies exclusively use Greenvision Energy for all of their electric heating solutions for their customers.
If you only have one bathroom, with just an electric shower you will only need a small cylinder or undersink heater that heats water at the point of use.
If the have multiple bathrooms and require two showers running at the same time with a drop in water pressure then a accumulator tanks are a good options.
If you are using a shower running off your water cylinder, you need to bear in mind that a pressurised water cylinder can use up to 8-12 litres of water per minute. So a 120L cylinder can be drained very quickly. Greenvision can advise on your best options
If you have economy 7 tariff it is a good idea to have two heating elements on your cylinder. One connect to your economy 7 power supply for cheap low rate electricity and the other elements connect to your on-peak supply for boosting your hot water outside of your economy 7 times.
You might be able to free up valuable space by moving the cylinder into the loft or garage. If your cylinder is located in your bathroom and you are planning to remodel your bathroom it could be a good time to plan ahead.
What are my options when replacing old water cylinders
More Reasons To Buy Unvented Water Cylinders
FAQ's about hot water cylinders
Yes, Greenvision has a range of cylinders that you can control via a smart app.
With this type of cylinder there is no need for a storage tank as water comes straight into the cylinder via the water mains. Mains pressure means gravity feed does not apply, so the cylinder (minus storage tank) can be positioned virtually anywhere at any height, and you get a much more powerful flow than from a vented system. Also, you don’t have to worry about water freezing in a header tank during very cold snaps.
In an unvented installation the system won’t suffer contamination because it is sealed and bypasses areas were impurities could get into the water. With regards to water expansion, the unvented cylinder has either a permanent air bubble infused at the top of the cylinder, or a fitted expansion vessel.
Both vented and unvented hot water cylinders can use either direct or indirect heating systems. With the indirect method the cylinder is heated by a gas boiler or other external source. Hot water passes from the heat source through a copper coil built into the cylinder. In this case it’s a good idea to fit a reserve immersion heater in case of boiler breakdown, so you still have hot water.
The direct method involves one or two heating elements inside the cylinder that heat the water directly. Using the two element option can be very cost effective because it is specifically designed to be used with the Economy 7 tariff – one element for peak day time use and one for off peak where the water is heated cheaply at night and used when needed.
Vented hot water cylinders need a water storage (header) tank to store water piped in from the mains. The tank is usually installed in the loft (or in the highest point in the property) and the system relies on gravity to create a reasonable pressure for the hot water to circulate throughout the property.
Vented cylinders are easier to install than unvented, but they do need a vent pipe to deal with water expansion issues. Households most likely to benefit from vented water cylinders would be properties with an electric shower only, no bath and just one or two people living there.
You should only have an unvented hot water system fitted and serviced by a qualified person holding a current G3 Unvented Qualification. All installations of unvented hot water cylinders have to be notified to Building Control as required by Building Regulations. If your installer is a member of a Competent Persons Scheme, this will happen automatically and you will receive a Building Regulation Compliance certificate.
A hot water cylinder should last for more than 20 years if fitted correctly and to the highest standard. However, the life expectancy of a hot water cylinder can be shortened by water leaks.
They can be installed in almost any location – the garage, upstairs, downstairs, loft or even in a basement. An unvented hot water cylinder needs a safety discharge pipe. Therefore in some basement locations, a sump and pump may be required.
You should consider replacing your hot water cylinder if it is leaking water, but drying at the same time. Leaking water can get worse over time and cause damage. Small leaks can be hard to detect so you should always check for any damp patches surrounding a hot water cylinder. Consult your plumber or call Greenvision Energy if you are unsure about whether your hot water cylinder has a slow water leak.
- If you get constant leaks or breakdowns it could work out cheaper to replace rather than to keep repairing.
- Your new boiler will be much more energy efficient and could pay for itself quite quickly.
- If you have a big family or use lots of water, a new professionally fitted boiler will be sized correctly for your needs, which may not be the case at present.
- If you have an old boiler with a red jacket you will be paying higher energy bills than you need to. You would be better off upgrading to a new cylinder and better tariff. The off peak tariff in conjunction with the two element cylinder could save you lots of money.
- If your water pressure is low and it takes forever to run a bath or the shower is just a dribble, a new unvented hot water cylinder will give amazing improvements.