Frequently Asked Questions

Here you’ll find the answers to the most common questions we get asked at DHS. If your question remains unanswered, please get in touch with us and we would be happy to help.


How often should I get my boiler serviced?

You should aim to have your boiler serviced yearly to make sure it is running efficiently and to minimise the risk of unexpected repairs.

Why should I consider replacing my boiler?

It might be that your boiler isn’t energy efficient anymore or that it requires constant fixing. You might end up spending a lot more on energy bills because of an inefficient, older boiler model. Find out how a new boiler can save you money.

Are DHS engineers Gas Safe registered?

Yes, all our engineers are Gas Safe registered and hold all relevant certifications with years of experience. We are also a Which? trusted trader, meaning we deliver the highest levels of customer satisfaction.

Which boiler should I choose?

If you’re replacing your boiler, we’d recommend a combi-boiler for maximum efficiency but we do offer a range of heating options for every household.

How much is a boiler?

This depends on the boiler you’re having fitted. We’d recommend getting in touch with us for a relevant quote. We do offer our boilers on finance so you can spread the cost of your new boiler throughout the year.

Why does my boiler keep losing pressure?

There’s a variety of reasons as to why this might be happening. The two most common reasons are water leaks or faulty pressure release valve. Read more about common reasons your boiler is losing pressure.

Why does my boiler keep turning off?

If your boiler keeps turning off, your home won’t be heated efficiently. The main causes of this are low water pressure or air in the system. You can find other common causes of the boiler switching off and on in our blog.

What is the difference between a boiler and an electric heater?

Both offer a way of heating your house, however gas boilers combined with radiators are much more efficient than electric heaters. You can read about the cheapest fuel for central heating on our blog.

Why does the boiler keep tripping the electricity?

If your boiler keeps tripping the electricity, it could be a sign of a leak in your boiler system. We recommend that you contact DHS to find the leak location and minimise further damage to your boiler.

Why is my boiler making banging noises?

Your boiler might be kettling, which is caused by a build up of limescale inside. Having your system powerflushed should remove this debris and stop your boiler making noises.

Why is winter the best time to get my boiler serviced?

Contrary to popular belief, winter is not the best time to get your boiler serviced. Winter is often the busiest time of year for heating engineers as many people will turn their boiler on after the summer and find it doesn’t work. Get your boiler serviced in the summer instead and avoid the winter rush.

Central heating

When should you replace your radiators?

Radiators typically last between 8 and 12 years. If you’re finding that they aren’t heating as well as they used to, then it’s worth bleeding the radiators and powerflushing the system. Failing that, if they still perform inefficiently, it may be time to replace your radiators.

How do you fix a radiator that’s cold at the bottom?

To fix this, you’ll need to bleed your radiator to release the air that builds up over time.

What are the benefits of a smart thermostat?

With a smart thermostat, you can control your heating from your phone or computer, making it much easier to monitor. DHS is a Nest PRO installer for Nest smart thermostats, so you’ll benefit from the highest level installation service.

What services do DHS offer?

DHS offer heating and plumbing, installation, maintenance and repair. You can rely on DHS for odd plumbing jobs around the home right through to complex heating installations. We are also a Which? trusted trader so you can rest assured that we will deliver a service you can rely on.

If you have any other questions, please get in touch with us.

Call DHS on 0117 924 7200, email us or fill in our contact form.