What is a combi boiler?
Combination boilers are economical and will provide your home with a constant flow of water, both hot and cold taps at the same rate. Bear in mind the flow rate may be reduced if you run more than one tap at once. Combi boilers heat water instantaneously and directly from the mains, which means no more waiting for hot water, a problem often encountered with storage cylinders. It also rids the need of a cold water storage tank which saves on space. A pump circulates the hot water through the pipes and heats up the radiators.
What are the advantages of combi boilers?
- Space saving
- No more hot water cylinder or storage tank
- Hot water at same flow rate as mains
- Heats water when needed
What are the disadvantages of combi boilers?
- Slower flow rates
- Multiple taps compromise flow-rate
- Dependant on mains pressure
Different types of combi boilers
An instantaneous combi boiler is used to be the most widely used combination boiler type and directly heats incoming mains cold water to supply your taps and all other hot water points.
An Instantaneous condensing boiler saves more energy and has better and higher efficiencies than the standard combination boiler, this is the most commonly installed type now. In fact, exceptional circumstances aside, all new gas and oil central heating boilers fitted in the UK must now be condensing boilers by law.
A Storage boiler is an alternative to the instantaneous combi boiler type mentioned above and is designed to give you better performance through the internal storage of heated water. The stored water also can give you an improved initial water supply from cold water mains on first turning on the tap. Once the stored heat has been used, this boiler tends to operate as an instantaneous type.
A storage condensing boiler operates in principle as a storage type but at higher efficiencies.
A Combined Primary Storage Unit is a special category of storage combination which will incorporate a very large water store allowing a high water flow rate to taps and other draw off points and to quickly heat radiators before the water store is used.
Factors affecting the installation cost
So installing a combi boiler should also be a pretty cheap job, right? Well, that’s not always the case. For one thing, every model is designed differently, and the costs of installing a combi boiler will depend on a number of practical factors such as size, whether or not radiators need replacing and the length of flue required to vent waste gases. You might also need to remove old water tanks in the attic and airing cupboard too, so all in all, it could take a couple of days to install a new combi boiler.
To help you on your way, we have provided this quick guide which explains just how much each aspect of installing a combi boiler might set you back.
How much does a combi boiler cost?
First of all, you will need to decide where you are going to purchase your new unit; each outlet will charge varying prices depending on the size and make of combi boiler you choose. According to Energy Saving Trust for the installation of a combi boiler you should expect to pay £1,500 – £4,000, depending on the difficulty and labour required.
Combi boilers wholesalers & retailers prices
From high-street retailers to local plumbers in your area, or even online companies, there are several retail outlets for you to choose from when purchasing a new combi boiler. Costs will vary from £600 to £2000 dependent on make and model. You will be able to get the best price possible by shopping around or going to local shops or traders to negotiate a better deal in person.
Prices direct from the boiler manufactureurs
Combi boiler prices vary significantly depending on the brand, insurance/warranty, installation, size and power. You should expect to pay around £500 to £1500. Bellow you can find the price range from several of the most popular models
|Combi boiler model and prices|
|Worcester Bosch Greenstar 42cdi Classic||Typical Price – £1374|
|Worcester Bosch Greenstar 34cdi Classic||Typical Price – £1,030|
|Vaillant ecoTEC Plus Combination||Typical Price – £784|
|Potterton Promax Combi HE Plus||Typical Price – £660|
|Potterton Performa Combi HE||Typical Price -£650|
|Baxi Neta-Tec Plus Combi GA||Typical Price -£640|
Alternatively, you can figure out the costs of a new combi boiler based on the amount of work that needs to be completed. Here are some examples that range from some of the cheapest to most expensive cost scenarios:
How much is a new combi boiler with installation?
Installing a combi boiler in a prepared area: £600 – £800
Installing a combi boiler in a new area that may need re-sizing: £650 – £1100
Installing a combi boiler and new radiators (including installing relevant pipework): £900 – £1,500
Removal of old heating system (including old water tanks and copper piping) and comprehensive replacement of all materials and fittings: £1,500 – £2,500
Power flush (variable) : £500
Moving pipes (variable): £300
New Thermostat: £200
Chemical Flash: £200
Add magnetic filtration: £150
Add radiators: £100
As you can see, the price of installing a combi boiler will vary from household to household; the most important thing is to save and budget before making your purchase – so you are absolutely certain you can afford the model you need. Additionally, you should never just buy the first thing that comes up; shop around and compare quotes to get the best deal you can, and that way the cost of your combi boiler installation will be kept as low as possible.