Boiler Installation Guide: Everything You Must Know

June 9, 2022

Boilers are one of the essential devices in today's modern home; we depend on them to fuel our central heating systems, which keep us warm during the winter. Boilers also heat our daily use water. As a result, when our boiler breaks down, we should get it fixed or install a new one as soon as feasible.

It doesn’t need rocket science to know if you need your boilers replaced with new ones. One thing to look out for is if you keep on calling for emergency boiler repair services, which can put a big hole in your pocket, then replacing your boiler may be a more practical solution.

After all, it's not sensible to use your neighbor's shower or heat the kettle up to do the dishes!

We've put together this helpful guide to assist you in better understanding your boiler and determining whether it's time to replace it or install a new one. Let's dig in!

Basic Procedure For Installing A Boiler

Depending on how intricate or complicated the boiler replacement process is, there are various techniques for installing a new boiler. Replacing a like-for-like combination boiler, for example, requires far fewer steps than replacing a combi boiler with a system boiler.

There are additional steps if you want your boiler installed in a different place, such as the loft or garage. Regardless of how hard an installation is, every boiler installation follows the same three procedures.

Taking Out the Old Boiler

The old boiler must be removed before a professional can begin installing your new one. Clearing space around your boiler and ensuring easy access to it will make this easier for them.

If your boiler is in the attic, it should be accessible by stairs and a safe walkway, and the space should be adequately lit. Before installing a new boiler, the heating engineer may need to remove old plumbing and radiators for a more involved boiler installation or relocation.

However, you must remember that taking out the boiler doesn’t mean you remove the entire thing haphazardly. There are steps to follow, like turning off the power and gas supply, draining the system, and disconnecting the unit before finally removing the boiler. This process can be tedious for an inexperienced individual, so relying on an expert is necessary.  

Additionally, you must responsibly dispose of your old unit by calling a collection service for old boilers that will recycle them appropriately.

Choosing The Appropriate Size

The right boiler for your home will be determined by the amount of space available, usage, and the type of fuel utilized. If your home is heated using mains gas, a gas boiler is usually the most cost-effective alternative.

If you don't have access to gas, consider a low-carbon heater such as a heat pump or biomass. If that doesn't seem feasible, you might want to investigate getting a gas connection established. Your local gas company can provide cost estimates, and it may even be partially or subsidized.

A boiler's size is measured in kW (kilowatts), and combi boilers (discussed below) are available in three sizes:

  • 24-27kW
  • 28-34kW
  • 35-42kW.

A 24kW boiler can easily heat a small house with roughly ten radiators and one bathroom. Professional boiler installation services will take the number of radiators, bathrooms, and people in your home. The larger the property, the more powerful the boiler required.

Choosing The Type of Boiler

The next decision is whether to go with a traditional boiler or a combi boiler; traditional boilers include a separate hot water cylinder, while combi boilers are all in one and hence much smaller.

Regular boilers are faster and more efficient, so this is probably the best option if you have a big house or a big family. A combi boiler should suffice if you live in a flat or a one or two-person family, and it will take up less room.

Getting a biomass boiler might be a suitable option if you’re moving toward reducing your carbon footprint. This renewable heating system is great for the environment since it works by burning organic materials such as wood pellets, wood chips, or logs to produce heat. Sometimes, they use agricultural waste such as corn husks and straws. Other times they use industrial wastes such as paper and sawdust when available.

Though it can come at a hefty price, you’ll be able to attain your sustainability objectives, and it will last for a very long time.

New Boiler Installation

The heating professional will commence the installation of your new boiler and associated plumbing after the old boiler, and any old pipework has been removed. This stage can be extremely quick, depending on how much work is required and how difficult the job is.

Tour of The New Boiler

After installing your new boiler and ensuring it is properly installed, the heating engineer will give you a product tour. This section explains how to operate the controls, what features the boiler offers, and how to program the boiler to turn on and off at specific times.

While you have the heating specialist around, take note of the characteristics of your new boiler and ask questions. This will assist you in properly and efficiently using your new heating system and provide you with an opportunity to ask questions of a professional.

Testing Your New Boiler

Congrats, you should now have a brand-new boiler installed and be ready to settle in and stay warm in winter. After all of the money and time spent installing, you'll want to double-check that everything is working correctly. It's a good idea to test your central heating system as soon as possible before the cold snap arrives and gas companies become overburdened.

Follow these steps to test your boiler:

  • Wait until your boiler is completely cool before turning the thermostat (separate or integrated into the boiler) to zero.
  • Turn off the hot water, then increase the temperature on the thermostat to see whether the boiler comes to life.
  • After 10 minutes, check the radiators (if possible, check all of them) for a consistent, even heat on top and bottom.
  • Turn the thermostat down or off if everything is operating correctly, and enjoy your new cozy warmth.

The technique is considerably simpler with combi boilers; turn on the hot taps and make sure they warm up in a constant, equal flow.

How Do You Tell If It's Time To Replace Your Old Boiler?

A conventional gas boiler should survive between 10 and 15 years, with the latter being more likely if it is serviced regularly. If your boiler is approaching 15 years old, it's good to start saving for a replacement.

The plumber or heating engineer who performs your next boiler service will be able to tell you how bad it is. They may also advise how much it will cost to replace your boiler, which may not be as much as you think.

If your boiler keeps breaking down, it's likely time to replace it and install a new one. You'll save money in the long term by avoiding costly repairs. Other warning indications include rising heating bills (an inefficient boiler consumes more energy to heat up), radiators that are warming up slightly but not as much as they should, weird hissing or popping noises, or strange odors originating from the unit.

The latter is very important to have checked since, as previously stated, it could indicate carbon monoxide gas.


Carlos Diaz
I believe in making the impossible possible because there’s no fun in giving up. Travel, design, fashion and current trends in the field of industrial construction are topics that I enjoy writing about.

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