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Frequently asked questions

Below are a number of questions we get regularly asked relating to the installation and servicing of boilers, plus some more general queries about plumbing and central heating systems.
We update our FAQs regularly, however, if you are still struggling to find your answer, feel free to get in touch with our experts at Arktek, we are here to help!

What is a thermostatic radiator valve (TRV)?

TRVs enables you to control the temperature of each radiator individually to control the temperature of a room by changing the flow of hot water to the radiator, therefore helping to improve comfort in your home as well as saving money and energy.

What is a combi boiler?

A combi boiler provides central heating and hot water combined. Meaning there is no need for a separate hot water cylinder, offering space saving within the property. It heats water instantaneously when a hot tap or shower is turned on.

Are combi boilers economical to run?

Yes, due to the fact that they only produce hot water when it is needed. Wide modulation ranges ensure smooth operation, fewer ignitions, greater reliability and lower fuel bills.

How often should I get my boiler serviced?

Your boiler should be serviced annually by a gas safe registered installer in order to check that it is working at peak efficiency and operating safely. An annual service is also a required to uphold your boiler warranty

What is a back boiler?

A back boiler unit (BBU) is a boiler that is built in behind an electric or gas fireplace and provides hot water and central heating in homes.

Why should I consider replacing my boiler?

You could consider replacing your boiler for a number of reasons, such as efficiency (high efficiency boilers can save you money on your gas bills), size (combi boilers can save a significant amount of space as they do not require additional hot or cold water tanks), changes to your home (changes to your home such as an extension may mean that your existing boiler no longer meets your hot water and heating demands),broken down/very old/parts no longer available (sometimes maintaining and repairing an old boiler is not cost effective, and sometimes parts are discontinued), No longer safe (when your Gas Safe registered engineer carries out an annual service they may find that your existing boiler is no longer safe, in this case, you will need to replace your boiler).

How could mains water pressure affect my combi boiler?

All cold-mains-fed combi boilers, it is essential that the water mains is large enough to deliver adequate water to the boiler whilst other cold water outlets are in use (e.g. washing machines, cold taps and toilet flushing). If the mains water is not sufficient, cold water could be taken from the boiler when more than one outlet is used.

Why should I have my heating system cleaned?

Overtime, corrosion in the central heating system can lead to a build-up of sludge. Signs of sludge in your heating system could be the boiler making loud noises, pin holes developing in the radiators, radiators having cold areas at the bottom and wearing of pumps and valves. A system flush, purification filter, cleaner and inhibitor can be used to clean/ protect the heating system.

How often should I need to top up the pressure on my heating system?

When the heating system is cool, the pressure gauge should read between 1 and 1.5 bar (in the green section), if the pressure is below 0.5 bar (in the red section) the indicates that water has been lost from the heating system and should be replaced. If the pressure is too high (2.75 bar or above) you will need to bleed a radiator until the pressure gauge returns to between 1 and 1.5 bar.

How would I know if my condensate pipe is blocked?

If your condensate pipe is blocked your boiler may make a gurgling sound when it is attempting to start, or it may repeatedly lock out or stop working. It may also show a fault code.

Who can install my new combi boiler?

All gas work should be carried out by a gas safe registered engineer.

What is the gas safe register?

This is the official list of gas engineers who are legally registered to work safely with gas appliances (e.g. boilers, cookers, fires etc.) to protect the public from unsafe gas work.

What do the letter ratings on my boiler stand for?

As part of the energy-related products (ErP) initiative, all gas boilers must show their energy efficiency rating. This is rated from G to A, with a G-rating being the least efficient and an A-rating being of the highest efficiency.

What sort of shower can I run off my combi boiler?

Combi boilers produce hot water at mains pressure, which means they are compatible to either a mains pressure balanced or thermostatically controlled shower. In contrast, when a regular boiler and cylinder is replaced with a combi boiler, any existing shower should be examined for suitability. This might be a pump assisted power shower, for example, designed for low-pressure systems.

My boiler is producing a 'gurgling' sound what could be the cause?

This gurgling sound may be caused by a blocked condensate pipe, please contact your installer to resolve the issue.

What type of boiler do I need?

The type of boiler you need will depend on the size of your house, plus your hot water requirements. We can help you choose the most appropriate gas boiler for your home.

What is a magnetic filter for a boiler?

A magnetic filter removes sludge which is circulating in the heating system. The sludge is made up of iron deposits in the central heating system – removing the sludge helps to keep your heating system operating at its best.

How long will my boiler install take?

Typically, a combi boiler replacement should be completed within one day. A system swap could take up to two days depending upon the install.

What is a flue?

Boiler flues are installed to ensure that combustion fumes are discharged carefully, efficiently and safely into the atmosphere. A boiler flue can be standard (horizontal) or vertical (exit the property the roof).

What is a room thermostat?

A room thermostat enables you to switch the heating system on and off as required saving energy and money. The room thermostat works but sensing the air temperature and switching on the heating when the temperature falls below the set temperature, and stitching the heating off once the temperature has been reached.

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