A new boiler in the Portsmouth area typically costs between £1,500 and £3,500 supplied and fitted. The price depends on the boiler type and brand, the size of your system and any extra work needed. This guide explains the main boiler types, what drives the cost and what to expect on installation day. All gas work must be carried out by a Gas Safe registered engineer.
A new boiler is a big purchase, and one of the first things every homeowner wants to know is what it will cost. The honest answer is that it depends on a handful of things, but there is a clear range to work within. In this guide we break down what a new boiler really costs in the Portsmouth and wider Hampshire area, what pushes the price up or down, and how to pick the right boiler for your home so you are not paying for more than you need.
What a New Boiler Costs
For most homes in and around Portsmouth, a new boiler supplied and fitted comes in between £1,500 and £3,500. That figure covers the boiler itself, the labour, and everything needed to leave you with a working, registered system. Where you land in that range comes down to the type of boiler, the brand, and how much work is involved in fitting it.
- Straightforward combi swap: replacing an old combi with a new one in the same spot is the most affordable job and sits toward the lower end of the range.
- Mid-range installs: a higher-output boiler, a well-known brand with a long warranty, or a few extras like a new filter and controls will move you into the middle of the range.
- More involved work: changing boiler type, moving the boiler to a new location, or upgrading tired pipework sits toward the top end.
Whatever the job, we give you a fixed quote after surveying your home, so the price you agree is the price you pay, with no hidden extras added on afterwards.
What Affects the Price
Two homes on the same street can end up with different quotes, and it usually comes down to these factors.
- Boiler type: a combi is generally the simplest and cheapest to fit. Systems that need a hot water cylinder cost more.
- Brand and warranty: premium brands cost more up front but often come with longer warranties, which can be worth it over the life of the boiler.
- Output and size: a bigger home with more bathrooms needs a higher-output boiler, which costs more than a compact unit for a flat.
- Moving the boiler: keeping the boiler in the same place keeps costs down. Relocating it means new pipework and flue runs, which adds to the price.
- Extra work: a system flush, a magnetic filter, new controls or upgrading old pipework all add to the total, but they protect your new boiler and help it run well.
Thinking About a New Boiler?
Call PHG on 07470 070659. We provide free, no-obligation quotes for boiler installation across Portsmouth and the wider Hampshire area.
Call for a Free QuoteCombi, System or Regular
There are three main types of boiler, and the right one for you depends on your home and how much hot water you use.
- Combi boilers: the most popular choice for most homes. A combi heats your home and gives hot water on demand, with no need for a separate cylinder or tank. Ideal for smaller homes and flats where space is tight.
- System boilers: these work with a hot water cylinder to store hot water, which suits larger families and homes with more than one bathroom, where you may want hot water at several taps at once.
- Regular boilers: also known as heat-only or conventional boilers, these use both a cylinder and a tank in the loft. They are usually kept where a home already has this kind of system and a full change would be disruptive.
Most homes we fit boilers for go with a combi for its efficiency and the space it saves. We will always talk you through the options and recommend the type that genuinely suits your home, not just the one that costs the most.
Choosing the Right Size
Size, or output, matters as much as type. A boiler that is too small will struggle to heat the home and keep up with hot water. One that is too big wastes money and can be less efficient. Getting it right is part of what a proper survey is for.
- Number of bathrooms: the more bathrooms and showers you have, the higher the output you need so hot water keeps up.
- Number of radiators: a larger home with more radiators needs more heating power.
- How you use hot water: a household that runs several taps at once has different needs to a couple in a flat.
Rather than guess, we work the correct size out during the survey so your new boiler is matched to your home. That keeps running costs sensible and means your heating and hot water perform the way they should.
Installation Day and Warranties
Most boiler installations are completed in a single day. A straightforward like-for-like swap is usually a one-day job, and we plan the work so you are back up and running by the evening. Here is roughly how the day goes.
- Isolate and remove: we safely isolate the gas and water, drain down where needed, and take out the old boiler.
- Fit and connect: the new boiler goes in, pipework and controls are connected, and a filter is fitted if it is part of the job.
- Commission and test: we commission the boiler, check the gas pressures and flue, and test everything is running safely and correctly.
- Register the warranty: we register the manufacturer warranty for you and leave you with the paperwork, then show you how the controls work before we go.
Warranties vary by brand and model, and a longer warranty is one of the reasons a premium boiler can be worth the extra outlay. Do keep in mind that most manufacturer warranties only stay valid if the boiler is serviced every year, so an annual service is money well spent.
Why Gas Safe Matters
Any work on a gas boiler must be carried out by a Gas Safe registered engineer. This is not a nice-to-have, it is the law, and it protects you in several ways.
- Safety: a badly fitted boiler can lead to gas leaks or carbon monoxide. A Gas Safe engineer is trained and qualified to install it safely.
- Warranty: manufacturers require Gas Safe installation. Work by anyone not registered can void your warranty completely.
- Insurance and selling up: your home insurance and any future buyer will expect proof of correctly certified gas work.
PHG is a Gas Safe registered company run by Josh and Hayden, with over 20 years of combined experience across Portsmouth and Hampshire. Every boiler we install is fitted and registered properly, so you have complete peace of mind. You can always ask to see an engineer's Gas Safe ID, and you can check any engineer at gassaferegister.co.uk.
Frequently Asked Questions
For most homes in the Portsmouth and Hampshire area, a new boiler supplied and fitted costs between £1,500 and £3,500. The final price depends on the boiler type, the brand, the output you need and any extra work such as new pipework or controls. We give you a fixed quote after surveying your home.
A straightforward boiler swap is usually completed in a single day. More involved jobs, such as changing the boiler type or moving it to a new location, can take a little longer. We give you a clear timescale with your quote so you can plan around the work.
A combi suits most smaller homes and flats because it gives hot water on demand with no cylinder or tank. A system boiler suits larger homes with more than one bathroom, where you may want hot water at several taps at once. We will recommend the right type based on your home and how you use hot water.
Yes. All gas boiler work must legally be carried out by a Gas Safe registered engineer. Using a registered engineer keeps you safe, keeps your manufacturer warranty valid and keeps you compliant for insurance. PHG is Gas Safe registered, and you can always ask to see our ID.
