Deciding which boiler will make an efficient and practical fit with your home and lifestyle can be confusing. The images below show the main system types, how they work, their advantages and what kind of homes they work best in.
If your new boiler is going to be fitted onto your existing system, please consider the cleanliness of your existing pipework and radiators as this could cause damage to your new boiler. For more information about system cleanliness, you can contact us for free no obligation advice,
A combination or ‘combi’ boiler is both a high efficiency water heater and a central heating boiler in a single compact unit. Combi boilers heat water directly from the mains when you turn on a tap, so you won’t need a hot water storage cylinder or a cold water storage tank in the roof space.
They are also very cost-effective and energy-efficient as water is heated instantly rather than being heated and then stored in a cylinder. An added benefit is that hot water is delivered at mains pressure, which means that you could get a powerful shower without the need for a separate pump.
System boilers require a cylinder for storing hot water, however the major heating and hot water system components are built into the boiler itself, making it quicker and easier to install. In addition, there is no need for a tank in the loft, so it can be an option in a home with little or no loft space or where the space is earmarked for a conversion.
These boilers are also compatible with solar water heating systems, which deliver environmental benefits as well as lower energy bills.
A regular boiler may be the best option for replacing an existing boiler if the property has an older radiator system, as it might not be able to cope with the higher water pressure that is delivered by system or combi boilers.
Changes to government legislation and technology advances in boiler design has driven boiler designs to condense to ensure as much heat as possible is converted into useful heat for your home. By condensing, your boiler will ensure at least 90p in every £1 you spend on gas or oil will be converted into heat for your home comfort.
long with heat, when gas or oil is burned within your boiler condensation is also created. This can be seen in the gases which plume out from the boiler, something that is especially noticeable in cold weather. However in addition to this condensate being discharged in the air, condensate also collects inside the boiler and is drained away either inside or outside your home. This is safe and nothing to worry about.
However if your condensate pipe has not been terminated according to our installation guidelines, there is a chance it could freeze in severe weather conditions. Please contact your installer in this instance.
The ErP Rating is a new requirement set by the European Union which is designed to drive improvements in the efficiency and performance of heating and hot water products. The ErP rating introduces new efficiency classes from A++ to G which are displayed on a labels which come with the boiler. ErP labels are already a common sight on washing machines, televisions and other appliances within electrical retailers.
The flue is the part of the boiler which allows exhaust gases to exit the boiler. The flue is typically situated directly behind the boiler enabling waste gases to exit safely straight out of the external wall of your home.
Quoted for Combi boilers, a flow rate represents how many litres of hot water comes out of the tap in a minute. Your flow rate is determined by the amount (and pressure) of water that is entering your property from the water main and the ability of the boiler to heat that water to the temperature you have set. The more powerful a boiler is (represented in kW), the faster the boiler will be able to heat the water coming into your home.
However it is important to recognise a high kW output will not always increase your flow rate. If you have 10 litres per minute coming into your property, you will only be able to receive 10 litres per min of hot water. For example having a boiler that has a maximum flow rate of 14 litres per min will not increase the amount of hot water you receive, if you only have 10 litres per min coming into your boiler.
Gas Safe Accreditation is the hallmark for gas safety in the UK. An installer must be on the Gas Safe Register to be legally allowed to work on your boiler or any other gas appliances in your home. www.gassaferegister.co.uk
SEDBUK stands for Seasonal Efficiency of Domestic Boilers UK. It provides a rating structure which provides both a percentage efficiency score as well as A to G rating enabling an easy comparison of boilers. SEDBUK has been integrated to the recent ErP labelling directive.
Old “Standard Efficiency” boilers waste large amounts of heat as they don’t Condense and recycle the heat before it leaves your boiler via the flue. In the current SEDBUK rating structure a Standard Efficiency boiler would be deemed G-rated and is likely to be 30% less efficient* than a new Worcester A-rated boiler.
Thermostatic Radiator Valves (TRV’s) enable you to control the individual temperature of each room in your home, and can be adjusted to the comfort levels you want. The higher the number selected on the TRV, the hotter the radiator and warmer the room. Please note a TRV should not be fitted on a radiator in the same room as a room thermostat.
An Unvented Hot Water Cylinder is a pressurised system which is fed directly from the cold mains water feed and therefore can deliver hot water at mains pressure, which is great for improving the performance of your shower and bath.
Unvented Cylinders don’t require a cold water storage tank, which is ideal if you are pushed for space as well as offering more flexibility when siting the cylinder.
The water can either be heated directly via an immersion heater or indirectly via the central heating system, solar thermal technology or other renewal energy such as heat pumps and biomass. If you are considering using multiple fuel sources, you may wish to consider a thermal store.
Unvented hot water cylinders require expansion vessels to be fitted to allow the expansion of water in the system as it heats up. Unvented cylinders also come with other safety mechanisms, such as pressure relief valves and twin thermostats.
To ensure safety and to comply with building regulations, it is essential that an unvented hot water cylinder is installed by a G3 qualified installer and serviced annually.
This is a term which is also used to describe a Regular boiler type. A Open vent system will have a “Open Vent” and tanks within the loft space. This type of heating system is typically common in older properties.