Selecting a New Boiler: A Homeowner’s Guide

Why investing a little bit more time and effort in researching your new heating system (boiler and controls) can pay off enormously

In case you’ve replaced your car lately, you’ll know that even a newer basic model is packed filled with gadgets and gizmos. Most individuals, nevertheless, are unaware that home heating(opens in new tab) technology has come on in leaps and bounds in a lot the identical way over the last decade. The nice news is that improvements in the boilers themselves, as impressive as they are, have been more than matched by innovations on the earth of heating control. The result is that, when you choose accurately, you’ll find yourself with a system that is not only cheaper to run however is simpler to use.

What’s more, in 2005 it turned obligatory for all gas-fired boilers fitted in homes, whether new installations or replacements, to be condensing boilers (oil boilers too, since 2007). They are more environment friendly – as they’ll recover the latent heat contained in waste gases – and are suitable for all homes.

Selecting a Replacement Boiler

Step one is to resolve which boiler(opens in new tab) is greatest for you: combi (quick for combination) or system? Combi boilers – Britain’s best-selling type of boiler, as they are compact and quick to install – provide heat to your radiators and sizzling running water on demand. They don’t need a water storage cylinder and so take up less area, making them preferrred for smaller properties.

To ensure you have sufficient scorching water for your loved ones from a normal single-coil cylinder, the rule of thumb is to permit 25 litres per particular person per day. We do, however, recommend that every one new installations have a twin-coil cylinder instead, to futureproof the house for the potential retrofitting of a solar thermal or renewable heating system.

It’s also price considering upgrading from a gravity-fed system (where pressure is generated from a cold water tank, typically positioned in the loft) to a four-pipe system. While most boilers in the UK have two pipes, which provide sizzling water and heating concurrently, Viessmann’s set-up uses four pipes to deliver sizzling water separately to each heating and hot water circuits. In doing so, the boiler prioritises sizzling water to ensure its immediate availability and heating water temperature is reduced so the boiler fully condenses many of the time. Because of this, a decrease output, more affordable boiler could be put in that makes use of less energy.

Combi Boilers

How they work:

Combis work as sealed systems, providing scorching water for each the taps and central heating system, heating the water directly from the mains as and when it is needed — that means there is no want for a hot water storage cylinder, or a cistern in the roof space.

Advantages: Combis are quicker, easier and cheaper to fit than system boilers, as well as space saving because of the lack of a cylinder or cistern. Water is delivered at mains pressure, so you’ll be able to enjoy a more highly effective (although not ‘power’) shower.

Disadvantages: It’s a previousity system, so it only satisfactorily deals with one heating want at a time. While fine for small households with one lavatory, bigger families will expertise poor flow rates when a number of outlets are used at once. Performance can be dependant on the diameter of the pipe entering the property: if it’s less than 22mm, then a combi is a bad choice.

System Boilers

How they work:

System boilers are fitted to sealed heating systems, but unlike combis work on the precept of storing hot water in a cylinder, so they can feed a number of shops at once at mains pressure. There’s no want for a cistern in the loft and the growth vessel is constructed in.

Advantages: Perfect for larger homes with higher calls for, and as they have most of their major components in-built (i.e. expansion vessel and pump), set up is quicker, cheaper and neater. Circulate rates are usually high as water is delivered at mains pressure, and scorching water is instantaneous.

Disadvantages: Will run out of hot water if overused. Some installers claim they are more complicated and prone to problems than common boilers, equivalent to pressure loss.

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