March 20, 2021

Which Boiler is Best for a 2 Bedroom Home?

When your old boiler breaks down and it comes time to replace it with a new one, it might appear tricky to choose the best one for your home, particularly as there is now such a wide range of boilers available on the market.

Which Boiler is Best for a 2 Bedroom Home?

Buying the wrong boiler for your home could lead to issues such as inadequate heating, failing to meet the demand for hot water and expensive energy bills. In this guide, we’re going to be looking at which boilers are best for a two bedroom home.

To ensure you find the right boiler for your home, there are a few things you should consider before buying. These include the:

  • Type of boiler
  • Output size
  • Physical Size
  • Efficiency
  • Warranty Available

Type of Boiler and Boiler Size

When talking about boiler size, we are usually referring to the output in kilowatts (kW) rather than the physical dimensions of the boiler itself. Kilowatts are the measurement of energy that is output by the boiler in the form of heat. The correct size of boiler for your home depends on your hot water demand as well as the number of bedrooms, bathrooms and radiators you have in your home. Generally, the higher your demand for heat and hot water, the higher the output you’ll require.

The kW outputs are measured differently for each type of boiler, so you should choose the appropriate kW for the type you will be buying.

Combi Boilers

A combination or ‘combi’ boiler is a gas boiler that integrates a water heating system and a central heating unit into a single body to produce instant hot water, so there’s no need for a separate hot water tank. One benefit of combining two different boilers into one body is that it takes up far less room in your home compared to system or regular boilers, making them perfect for homes where space and storage is an issue.

Output in kW Bedrooms Bathrooms Radiators
24-28 1-2 1 Up to 10
28-35 3-4 1-2 Up to 15
35-43 4+ 2+ Up to 20

As your home has two bedrooms, you would require a combi boiler with an output between 28-30kW. If you live in a smaller sized home with up to 10 radiators, you would most likely need a 28kW boiler, whereas if you live in a medium sized house with up to 15 radiators, you’ll need a 30kW boiler.

Regular Boilers

Regular boilers are also known as ‘conventional’ or ‘heat only’ boilers because they don’t provide domestic hot water on demand the same way combi boilers do. Instead they store hot water in a cylinder until it is delivered to a tap or shower. An advantage of this is that they can meet a high demand for hot water at once, making them ideal for properties with multiple bathrooms, though when the water does run out, you'll have to wait for it to fill up again.

Output in kW Bedrooms Bathrooms Radiators
10-18 1-2 1 10
18-26 2-3 2-3 15
27-40 4+ 3+ 20
Cylinder Capacity (Litres) Bedrooms Bathrooms
120-150 1 1
180 2 1
210 3 2
250-300 4 2
300+ 4+ 2+

As your home has two bedrooms, you’ll need a boiler with an output between 18- 26kW and a cylinder with a 180 litre capacity. If you have 1 bathroom, you’ll likely just need an 18kW system boiler, whereas a home with 2-3 bathrooms will likely need a 26kW boiler.

System Boilers

System boilers directly take water from the mains as opposed to using a feed and expansion tank like a regular boiler in order to heat up your central heating system and produce hot water for a water storage cylinder.

Output in kW Bedrooms Bathrooms Radiators
12-15 1-2 1 10
18-24 3-4 1-2 15
30+ 4+ 2+ 20

As your home has two bedrooms, you’ll need a boiler with an output between 15kW and 18kW+. If you have 1 bathroom, you’ll likely just need a 15kW system boiler, whereas a home with 2-3 bathrooms will likely need a 18kW boiler.

There are some exceptions when it comes to choosing the rightsize of boiler, such as if you have a large family which has a high demand for hot water or a home with lots of radiators (20+) and multiple bathrooms, in which case you’ll need a bigger boiler output to accommodate your additional heat and hot water needs.

If your home lacks cavity wall insulation, loft insulation, double/triple glazed windows and decent sealing around doors and windows could mean that you are losing a lot of heat from your home and will therefore also require a higher output if you are not intending to make those changes in the near future. For more information on choosing the right size boiler for your home, read our helpful boiler size guide.

Physical Size

If limited storage space is a problem in your home, finding enough room for a physically large sized boiler can be difficult and inconvenient. Luckily, many manufacturers offer compact sized boilers for smaller spaces, such as in a kitchen cupboard or in a small airing cupboard.


The efficiency of your boiler plays an important part in how well your boiler operates as well as the cost of your fuel bills. The higher the efficiency of your boiler, the lower the wasted fuel and therefore the lower your fuel costs. The Energy Saving Trust estimates that you could save up to £380 a year by replacing your old inefficient boiler with a new A-rated one.

If cutting fuel costs and boiler efficiency are important factors to you, you should make sure you purchase an A-rated efficient boiler, meaning it is 90%+ efficient. iHeat only installs A-rated boilers because we believe efficiency is incredibly important. For more information, why not read our helpful guide to the most energy efficient boilers.


Boiler insurance can be expensive and sometimes unnecessary, so long as the boiler you purchase has a good warranty period. At iHeat, all of our boilers have warranties between 7 and 10 years, during which time the warranty covers your boiler against manufacturing/material defects for both parts and labour. To claim under the warranty, you must ensure that the boiler has been maintained and inspected by a Gas Safe registered engineer on an annual basis. See our terms & conditions for more information.

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Our Top Boiler Picks for Homes with 2 Bedrooms

Viessmann Vitodens 100-W 30kW

- From £2,245 (Including installation)

Efficient, compact, quiet and affordable, the Viessmann Vitodens 100-W gas condensing boiler is the most popular solution available at iHeat.

Featuring innovative technology and services combined with reliability and longevity and comes ready for smart technology, helping you to optimise your heating and save on energy costs. Vitodens 100-W 30kW Combi reviewed as a Which? Best Buy 2019.

Viessmann Vitodens 050-W 29kW

- From £1,825 (|Including Installation)

With compact dimensions, low weight and quiet operation, the attractively priced Vitodens 050-W is a low-cost gas condensing boiler that will integrate effortlessly into any living space and does not compromise on quality; making it ideal for both new build homes and modernisations.

Worcester Bosch 8000 Style 30kW

- From £2,595 (Including Installation)

The latest Worcester Bosch boiler features a modern new design whilst being packed with innovative new features that help keep your home warm and your boiler working at its best.

Alpha E-Tec 28kW

- From £1,545 (Including Installation)

The E-Tec range features a brand new stainless steel heat exchanger and is our smallest yet. Being compact allows an easy fit in a standard kitchen cupboard and servicing is made easy with front access.

Get a Free, Fixed Quote from iHeat

If you’re still unsure of which boiler is best for your two bedroom home, there’s no need to worry. When you get a free, online quote for a new boiler with iHeat, we ask a few simple questions about your home to work out the right kind of boiler for you. Get a free, fixed quote here.

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