Guide to Buying a New Boiler

Are you wondering how to buy a new boiler in 2021? Are you looking for more information on the cost of a boiler replacement costs and efficiency?

Ollyy /

Our new boiler guide is designed to help you to understand the basic costs involved in purchasing different types of gas boilers. We’ll walk you through all the important areas that impact your choices when looking for a new boiler; not just the initial outlay but also maintenance and operating costs.

Considerations when buying a new boiler

When choosing a new boiler, you might be tempted to cut corners and save some money. This is false economy. It is important to always use a licensed contractor for any boiler replacement work, which will help ensure your warranty is valid. If you have the option of a longer warranty period, please note that many warranties require an annual service to remain valid.

Carefully consider which brand you purchase as performance and reliability can vary dramatically by brand. While it may seem logical to buy a budget brand and hedge your bets, it could affect you negatively. New boiler costs for budget ranges often reflect the shorter warranty period and lack legacy support for spare parts.

New boiler installation costs

New boiler installation costs are influenced by boiler type, which include:

  • Combi boilers
  • Conventional boilers
  • System boilers

There are pros and cons to when considering how to choose a new boiler. Speaking to a licensed and experienced boiler installer can help you in your decision.

Installation engineers work with boilers every day, so when it’s time to upgrade your boiler talk to them about what’s most important to you. For example: Greater energy efficiency and lower running costs, more hot water or the ability to run two hot water taps at the same time.

Combi boiler installation

A combi boiler not only provides heated water for your central heating system, but it also gives hot water on demand. If you are replacing like-for-like, then the combination boiler itself is more expensive but installation costs are lower. Likewise, if you are fitting a new heating system to a property then the overall costs to fit a combi boiler would be lower than fitting a conventional boiler.

There are some considerations to make when looking at new combi boiler prices, such as:

  • The size of your property
  • Installation costs of a new boiler
  • Additional variable installation costs and extras
  • How much hot water you use

Let's look at the estimated costs* of combi boilers in 2021: 

* Please note that the prices listed below do not include installation or labor costs. Installation can vary greatly, and costs are influenced by many factors including location, current piping configuration and other circumstances that are unique to every installation site.


New combi boiler prices

Size of your property Estimated new combi boiler cost
Small condo or apartment $1,000 - $3,600+
Semi-detached or terraced $2,500 - $5,000+
Mid-to-large detached home $3,600 and up
Chinnapong /

Working out the total cost for your new boiler

The table above represents average new boiler costs for a combi boiler. As you can see the prices vary greatly, which is why pricing up a new system can be difficult. In many cases when people price up a new combi boiler, they are not aware of the additional costs involved, for example:

Scenario one – Replacing a conventional boiler in a small home

If your system is old, then it may require a powerflush to remove any sludge that has built up. This then increases the cost of a new combination boiler installation accordingly.

Scenario two – Replacing a cast iron boiler with a new condensing boiler in a larger home

As you’d expect, a larger boiler is more expensive. Then add in the costs of the installation and the additional labor needed to reconfigure the pipework. Suddenly, the cost jumps up significantly higher than the average boiler installation cost, as the work needed is quite time-consuming.

Saving money with your new boiler

It is often advised to ask for more than one independent quote when looking for the cost of a new boiler purchase and installation. It’s an investment for the future that could save money in if you make the right decision.

Here are some factors to consider:

Efficiency saving

Year-over-year you’ll enjoy not only the comfort of a warm home, but you’ll begin to offset your new boiler costs by saving energy. If you’re looking to purchase a Viessmann boiler, expect an efficiency of 95% AFUE, which could save you money on your monthly heating bills.

Life expectancy

As you would imagine, premium products are made to last. Manufacturers using high-quality components such as stainless-steel heat exchangers generally have a longer lifetime expectancy, usually resulting in longer manufacturer warranties.

Final thoughts

While the overall cost of a budget boiler may look attractive in comparison to a premium product, do not overlook lifetime value. For more information on Viessmann boilers, contact us today.

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