Regular boilers

Regular boilers, sometimes called heat-only or conventional boilers, are perfect if you have a big family that uses a lot of hot water at the same time.

Boiler installations

In light of the coronavirus outbreak, we wanted to share with customers our approach to installing your new boiler to ensure we keep everyone as safe as possible in the current climate. It is really important that we can still make sure you have heating and hot water by replacing your broken or faulty boiler, but do it in a way that is safe for you and for our installers. For more information, visit our installation page.

Spread the cost for up to three years with 0% APR1

Includes all parts, labour and the removal of your old boiler

You can get a quote through a video call and next day installation is available.

Awarded Which? Best Buys for our Worcester Bosch conventional boilers

A regular boiler is perfect if

  • You already have an existing regular/conventional boiler – old radiators are sometimes unable to cope with higher water pressure delivered by system or combi boilers
  • You have low water pressure in your area – as the water tank is in the loft, flow rate is controlled by gravity instead of relying on water pressure from your mains 
  • You have a large home where multiple taps and showers are on at the same time

How do regular boilers work?

To maintain the water level needed for your heating, a conventional boiler is linked to a separate cold water storage tank usually found in the loft. When you need hot water, a heat exchanger heats the water from the tank. Heated water is then pumped to a hot water cylinder where it’s stored ready for you to use. 

Why choose a regular boiler?

A comfortable and warm home

Unlike a combi boiler, you’ll be able to switch on multiple taps and appliances at the same time with minimal effect on your water pressure. 

Reliable and safe installation by professionals

Our Gas Safe Registered experts will wear protective gear to keep you safe following COVID-19. We can install your regular boiler within 1-5 working days if you’re without heating or hot water2.

Buy a new regular boiler in four easy steps

Find your perfect boiler

You can get an online quote in two minutes, or book a free video call with an energy expert.

Book an installation

With installation included in your fixed price, you can book a timeslot to suit you.

Get your boiler installed

We’ll remove your old boiler, flush your system, install your new one and show you how to use it.

We’ll provide post-installation support

Unlike other companies, we’re always here to help with any heating needs.


Spread the cost with finance

Spread the price of a regular boiler over three years – whether that’s making monthly payments, at no extra cost, with interest-free credit (0% APR)1 or with our other affordable options. We’re a credit broker and not a lender.

Boiler types explained - what is the difference between a regular boiler and a system boiler?

There are three types of boiler – regular, system and combi:  

  • Regular boilers – these heat-only boilers are linked to a cold water tank kept in the loft. Water is heated by a heat exchanger and then stored in a hot water cylinder ready to be used.
  • System boilers – have a built-in heat exchanger in the boiler, so water is heated up and stored hot water in a cylinder. A water storage tank in the loft is not needed.
  • Combi boilers – not linked to a hot water cylinder or tank in the loft, water is taken directly from the mains and heated by the boiler on demand i.e. when you  switch your tap on.

Combi boiler or conventional boiler?

Should you replace your conventional boiler with a combi boiler? We recommend sticking to a heat-only boiler if:

  • You have a big and busy home where you need a supply of hot water to multiple outlets at the same time. Unlike a combi boiler, if multiple taps are running there will be minimal effect on water pressure
  • Water pressure in your area is low 
  • If you already have a conventional boiler and have older radiators

We recommend changing to a combi boiler if: 

  • You don’t need more than two taps or showers running at the same time
  • You want to save space and use your loft – combi boilers do not need a cold water storage tank or hot water cylinder

We know finding the right boiler can be confusing – answer a few questions on our online tool or read our guide on choosing a boiler and we’ll find a conventional boiler perfect for your home.

What size regular boiler do I need?

The size of a regular boiler you need depends on your heating demand, which means the number of rooms and radiators in your home as well as the number of bathrooms and hot taps running at the same time. 

If you have one to two bedrooms you will most likely need a boiler between 12-28 kWs. If you have three to four bedrooms you will need a boiler between 18-35 kWs and for a home with more than four bedrooms a boiler over 35 kWs will be most appropriate. Each radiator in your house adds an extra 1-2 kWs. Find out more about what size boiler you need

Should I swap my regular boiler for a combi boiler?

While combi boilers are compact and can be more economical, they can be unfit for larger homes with higher hot water demands where regular boilers are a better fit. Regular boilers are also well suited for homes with low water pressure and old radiators. 

It is possible to swap a regular boiler for a combi boiler, but it isn't suitable for every home. We recommend that you contact our professional heating experts who will be able to provide an expert recommendation.

The legal stuff

1 E.ON Energy Installation Services Limited acts as a credit broker and not a lender and work exclusively with Creation Consumer Finance Limited who acts as the lender. Credit subject to status, Terms and Conditions apply. E.ON reserves the right to amend its finance offering at any time and may withdraw at short notice. E.ON Energy Installation Services Limited is registered in England and Wales under company number 09965944 with its registered office at Westwood Way, Westwood Business Park, Coventry, CV4 8LG. E.ON Energy Installation Services Limited is authorised and regulated by the Financial Conduct Authority in relation to credit broking services under number 750410.

2 If you accept the terms and conditions on your quote and either make an upfront payment or accept the terms and conditions of your finance agreement before noon.