Updated: April 18, 2024

Looking to replace your boiler but feeling overwhelmed by the process? Let Let’s Heat simplify things for you. Our comprehensive New Boiler Guide is designed to streamline your decision-making process, ensuring you find the perfect boiler for your home without the hassle.

Your boiler is a crucial component of your household, providing hot water for both your taps and heating system. At Let’s Heat, we understand the challenges of boiler shopping – it can be complex and expensive. That’s why we’ve curated all the essential information you need, right at your fingertips.

From understanding the different types of boilers to assessing your home’s heating requirements, our guide covers it all. Say goodbye to confusion and uncertainty – with Let’s Heat, finding the ideal boiler has never been easier.

New Boiler Guide, The cost for a new boiler replacement

The first thing you might think of when buying a new boiler is the possible cost. Boilers can be expensive but getting a good boiler is a good investment.

You will of course want your boiler to be efficient and to last for years to come.

The price for a new Boiler replacement can vary, depending on many crucial elements:

  • The type of boiler you want to install in your house (e.g. combi, system or regular)
  • Moving you boiler to a different location
  • The model you aim to buy (e.g. mid-range vs. premium)
  • Converting your current boiler with another type (e.g. system to combi)
  • The extras you get (e.g. filters, a controller or smart thermostats)

Undoubtedly, opting to replace your existing combi boiler with a new one is typically more cost-effective than converting your system boiler to a combi boiler. Dive into our New Boiler Guide to learn more.

Converting your boiler entails a lengthier process, requiring additional time, labor, and materials. The complexity of the conversion further adds to the challenges.

Moreover, the model you select significantly influences the overall cost of a new boiler. At Let’s Heat, we proudly offer a range of top-tier brands in the boiler industry, including Alpha, Worcester Bosch, and Viessmann.

When you choose Let’s Heat, you’ll have access to multiple payment options tailored to your preferences. Whether you prefer paying upfront in cash or opting for a convenient boiler finance plan allowing monthly payments, we’ve got you covered.

Some important factors to consider for a boiler replacement:

As has been noted, a new Boiler replacement might not be that cheap. So it’s important to consider some key factors before making your final decision.

Read more : Everything You Need To Know About Boilers – Smart Adapt

The size of boiler you need (kW output)

To clarify, selecting the optimal boiler output is crucial; it shouldn’t be excessively high to avoid inflated energy bills nor too low to meet your household’s demands. Refer to our New Boiler Guide for detailed insights.

By assessing the number of bathrooms and radiators in your home, you can determine the suitable output rating. This assessment aids in understanding the domestic hot water and central heating requirements.

For personalized guidance, we recommend obtaining a quote from a Gas Safe registered engineer. Additionally, if you have a preferred brand in mind, review their website and guidelines. Many manufacturers offer valuable advice online.

Read more : New Boiler Buying Tips That You Should Know

Here is a table to guide you through what you need to know:

No. of bedrooms1 bath & shower2 baths & showers
2-bedroom house26kW29kW
3 -bedroom house29kW35kW
4-bedroom house29kW35kW
5-bedroom house35kW35kW

To point out, small homes with one bathroom and little or no space for a cylinder should consider getting a combi boiler.

Location of the new boiler

Opting to install your new boiler in the existing location offers cost savings and simplifies the installation process.

Alternatively, if you choose to relocate your new boiler, expect additional expenses. Relocation involves extensive work and materials, including installing a new flue and rerouting pipework throughout your home. This process can be messy and disruptive.

Read more : Different Types Of Boilers – Smart Adapt

Energy efficiency 

If you’re looking to reduce your carbon footprint, save money, and create a cozy, warm atmosphere in your home, it’s crucial to invest in an energy-efficient boiler.

Let’s Heat offers state-of-the-art A-rated boilers that can be purchased alongside a smart thermostat to minimize energy wastage.

By replacing your outdated boiler with an A-rated model and implementing heating controls, as recommended by the Energy Saving Trust, you could potentially save approximately £340 and reduce carbon dioxide emissions by 1,500kg per year.

Regular Boilers and how does it works

new boiler installation

The duration of a replacement boiler installation can vary depending on the complexity of the job. Certain installations may take longer than others due to their specific requirements.

For instance, if you’re replacing a combi boiler with another combi boiler, the installation process typically takes approximately 1 day.

On the other hand, converting a combi boiler to a system boiler, for example, may require a longer timeframe of around

Read Also : Types Of Boiler Systems Explained

When should you replace your boiler?

Typically, boilers have an estimated lifespan of around 10 years. If your boiler has reached or exceeded this age, it’s a good indication that it’s time for a replacement. For more detailed information, please refer to our New Boiler Guide.

In addition to age, there are other factors that may suggest the need for a new boiler:

Your current boiler is old and inefficient:
Boilers that are over 10 years old typically have a G-rating and operate with an efficiency of around 70%. This means that 30% of the energy you pay for is wasted. Modern boilers, however, are 90% efficient, resulting in significant energy savings.

Costly repairs:
Sometimes, repairing a broken boiler can be prohibitively expensive, especially when major components like the PCB or heat exchanger need replacement. In these cases, it may be more cost-effective to invest in a new boiler instead.

If you plan to change the location of your boiler, it makes sense to install a new one with a fresh warranty rather than moving the existing unit.

Insufficient hot water supply:
If your current boiler struggles to meet your household’s hot water demands, it may be time to upgrade to a newer model with a higher power output.

For more information and guidance, please consult our comprehensive New Boiler Guide.

Read Also : Electric Boilers V Gas Boilers In 2024

What are the types of gas boiler replacement?

If you’re getting a new boiler, then you should know that there are three major types:

Combi boilers

  • Their compact design makes them perfect for homes with limited space
  • Do not require a hot water storage cylinder or a cold-water tank
  • Unsuitable for larger homes with multiple bathrooms and a high demand for hot water
  • Not suitable for areas with low mains water pressure

Regular (heat only) boilers

  • Good for homes with multiple bathrooms and a high hot water demand 
  • Perfect for areas with low water pressure from the mains
  • Suitable for homes with older heating systems that may not be able to tolerate high pressure
  • They take space since they need a cistern tank
  • A tank in the attic can freeze in winter and might cause many problems if it starts leaking

System boilers

  • Also recommend for homes with more than one bathroom and a high demand for hot water
  • Do not need a tank in the attic
  • Internal components can make installation much easier.
  • Unsuitable for areas with low water pressure 
  • Not suitable for homes with traditional heating systems that can’t tolerate high water pressure 
  • You need to consider where to put the water tank if a system boiler is replacing your combi boiler.

Read Also : Best Combi Boilers & Brands

Central Heating Services In Pontypridd

What is meant by a Condensing Boiler?

Understanding the difference between condensing and non-condensing boilers can be confusing when shopping for a new boiler. For detailed information, please refer to our New Boiler Guide.

Currently, it is a legal requirement for new boilers to incorporate condensing technology. Therefore, when purchasing a new boiler, you don’t need to worry about whether it is condensing or not.

Condensing is not a specific type of boiler, but rather a technical feature. Condensing boilers are equipped with larger heat exchangers that allow for the recovery of additional heat from the fuel. This heat would have otherwise been wasted in non-condensing boilers. As a result, condensing boilers are more efficient.

Non-condensing boilers, on the other hand, are less efficient, losing approximately 50% of heat in the combustion exhaust gases. In contrast, condensing boilers capture this heat and utilize it to heat water, making them significantly more efficient.

Condensing boilers achieve energy efficiency levels of around 90%. They utilize excess energy to heat your property and are environmentally friendly, leading to reduced heating bills.

For more comprehensive information on condensing and non-condensing boilers, please consult our New Boiler Guide.

Energy regulations

Over the last few years, the UK has passed some guidelines for boiler installation and energy efficiency:

  • Gas boilers should have at least a 92% ErP efficiency regardless of boiler type.
  • A Combi boiler installation should have one energy-saving feature.
  • You should have functioning time and temperature controls.

Which boiler brand to choose from?

We offer a range of boilers from various brands. Here are some of the options we provide:

Viessmann Boilers:

Viessmann boilers have gained recognition for their technical excellence and have received numerous awards. Known for their German engineering and sleek designs, Viessmann holds a strong reputation and dominates the European boiler market.

Worcester Bosch Boilers:

Worcester Bosch is a well-known and highly regarded name in the boiler industry. They have earned awards for their boilers and are considered one of the best brands in the UK. Worcester Bosch is known for their excellent guarantee offers, reliable customer service, and the availability of easily sourced parts.

Alpha Boilers:

Alpha has seen an increase in market share in recent years due to being a budget-friendly option for many customers. It offers affordable boilers that cater to different needs.

When choosing a boiler brand, it’s important to consider factors such as budget, specific requirements, and the reputation of the brand. Our team can provide further guidance and assist you in selecting the right boiler for your needs.

It is a fantastic option for people who are looking for a reliable yet affordable boiler.

Read Also : The Best Brands Of System Boilers & Pricing – Smart Adapt

Can I get the next-day boiler installation?

Yes, it is possible to have your boiler installed the next day. To avail of this service, you would need to place your boiler order before 12 pm during the colder months and 2 pm in the warmer months.

We offer nationwide next-day boiler fitting services in England, Wales, and Scotland. This means that even during the coldest winter days, you won’t have to endure a long period without heating.

It’s worth noting that not many boiler companies can accommodate such short notice installations on a nationwide scale. If you require a new boiler, we recommend requesting a quote from us as soon as possible to ensure timely installation.

Finance option 

If you find yourself unable to buy a new boiler outright, then you should consider a boiler finance plan.

If you are eligible to use boiler financing, then you will be able to pay monthly for your boiler over the course of 2, 4, 6 or 10 years.

To sum up:

  • No deposit is needed
  • You can make overpayments with no penalty 
  • The ability to spread the cost over 2, 4, 6, or 10 years
  • Interest rates from 9.9% APR


  1. Which boiler is best 2021?

    #1 Viessmann Boilers.
    #2 Worcester Bosch.
    #3 Ideal Boilers.
    #4 Alpha Boilers.
    #5 Valliant Boilers.
    #6 Baxi Boilers.
    #7 Glow Worm Boilers.
    #8 Potterton Boilers.

  2. What should I look for when buying a boiler?

    The first thing you might think of when buying a new boiler is the possible cost. Boilers can be expensive but getting a good boiler is a good investment, Get a quote from let’s heat.

  3. What type of boiler should I get?

    We offer a variety of different boilers from different brands. You can take a look at some of the types we offer down below:
    Viessmann Boilers 
    Viessmann boilers have won plenty of awards. They have a reputation for being technically superb. 
    With its superb German engineering and simple, crisp designs, it has a 5-star reputation. Needless to say that it dominates the European boiler market.
    Worcester Bosch Boilers
    When it comes to boilers, then rest assured that Worcester Bosch is a household name. It is an award-winning boiler.
    It is the best boiler brand in the UK thanks to their excellent guarantee offer, customer service, and easily sourced parts.
    Alpha Boilers
    Over the last few years, Alpha has increased its share of the market due to it being a budget option for many customers.