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July 27, 2016

What is the best combi boiler for my property?


Worcester System & Combi BoilersChoosing the right combination of product & price when installing a new central heating / hot water system for your home can be made a little easier if you are forearmed with a good idea of what to look for in the first place – so with that in mind, here are a few pointers.

 To start with

  • Size of the property

Small, medium or large house? The size of your house will generally determine the size & type of boiler required because a 1 bed flat or studio is clearly going to have a lower demand for water than a 4 bed detached house.

Examples of Boilers that may suit a particular property size

BOILER MODELProperty Power (Kw) & Flow (litres / min)
Baxi EcoBlue Advance 40LARGE32 kW & 16.4 L/pm
Vaillant ecoTEC 938LARGE28 kW & 15.9 L/pm
Worcester Greenstar 42CDiLARGE30 Kw & 17.2 L/pm

 

BOILER MODELProperty Power (Kw) & Flow (litres / min)
Baxi EcoBlue Advance 33MEDIUM28 kW & 13.5 L/pm
Vaillant ecoTEC 832MEDIUM24 kW & 12.7 L/pm
Worcester Greenstar 30SiMEDIUM24 Kw & 12.3 L/pm

 

BOILER MODELProperty Power (Kw) & Flow (litres / min)
Baxi EcoBlue+ 24SMALL24 kW & 9.8 L/pm
Vaillant ecoTEC Pro24SMALL19 kW & 9.6 L/pm
Worcester Greenstar 25SiSMALL24 Kw & 10.2 L/pm
  • Power output

Having an underpowered boiler will result in lack of heat and an overpowered one is just wasting energy, also the “flow rate” of the boiler should be one which can readily meet the likely water demands for your home.

  • Energy Efficiency Rating

Up until Sept 2015, the SEDBUK rating would have identified the energy efficiency, but now it is covered by the ErP or Energy-related Products Directive – find out more here

  • How big is the boiler and where to locate it?

The appliance does not have to be big in order to deliver a good result, with modern engineering allowing dimensions to become more compact you can fit them in many locations.

  • Warranties & Guarantees

There would be a warranty form the appliance manufacturer on the boiler itself, but you also need to make sure the rest of the work is covered by the company that fits the system – including a maintenance agreement.

Product warranties can range from 2-10 years and some installers can offer workmanship warranties of 2-6 years – typical manufacturer warranties shown below:

COMBI BOILER MODELWARRANTYMODEL RANGE
BAXI2 – 10 yearsUp to 10 yrs on platinum
VAILLANT2 – 5 yearsPro, Plus & Exclusive
WORCESTER BOSCH5 yearsI, Si & CDi models

Appointing an Installer

Obviously you should get a number of quotes from different companies, but in doing so you may encounter varied approaches from those who quote. The first thing to tale into account is whether you are dealing with a salesperson or an engineer.  Whilst a well trained salesperson may very well be able to come up with a solution for you, in our opinion they are less knowledgeable than a qualified Heating engineer and in some cases be more interested in making the sale than looking after the clients’ best interest.

In any event, you should only deal with “Gas Safe” registered installers when fitting gas fired water & central heating systems.

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