Mon–Sun, 8:30am–5:30pminfo@harrisonejonesheating.co.uk 07523 7382850151 384 5908 HomeAboutServices Areas ReviewsContact Us07523 738285Get a Free Quote New Boilers Fully Fitted from £1,299 with Immediate Installation and a FREE Gas Safety Certificate HomeHeating adviceHeating advice # New Boiler Costs Explained: What Changes the Price New boiler prices vary far more than people expect. Here's what genuinely changes the cost of a new boiler installation, and what a fair fitted price should cover. Get a Free Quote07523 738285 Gas Safe registered no. 576059: fixed written prices before work begins If you've started asking around about a new boiler, you'll have noticed the quotes can look very different from one company to the next. That's rarely down to guesswork or padding, it usually comes down to real differences in the work involved. Understanding what actually drives the price helps you compare quotes properly and spot when something has been left out. Here's a breakdown of the main factors that affect what you'll pay for a new boiler in 2026, and what a fitted price should include. ## Boiler type: combi, system or regular The type of boiler you need has the single biggest impact on cost. A combi boiler heats water on demand and needs no cylinder or tanks, which usually makes it the most straightforward swap in homes that already have one. A system boiler works with a hot water cylinder and is often chosen for houses with higher hot water demand or multiple bathrooms. A regular (heat only) boiler keeps the existing cylinder and feed tanks, which suits some older systems but adds complexity if any of that pipework needs attention. Moving between types, for example replacing a regular boiler with a combi, involves more work than a like-for-like swap. That's not a bad thing if it suits your household better, but it does add labour and materials, so it's worth knowing which route you're being quoted for and why. ## Output and sizing Boiler output is measured in kW and needs to match your home's heat demand and hot water usage, not just be picked from habit. A boiler that's too small will struggle to keep up, especially with hot water at a decent flow rate. One that's oversized costs more upfront and can run less efficiently. A proper survey should look at radiator count, property size and hot water demand before recommending a specific output, rather than quoting a generic size. This is one of the areas where a fitted price can differ significantly between quotes, because getting the sizing wrong either inflates the quote unnecessarily or under-specifies the job to make the number look better. ## System conversion work If you're changing boiler type, or the existing system needs updating to work properly with a new boiler, there's conversion work involved. This can include removing old cylinders and tanks, capping off redundant pipework, running new pipework to the boiler's new location, and making sure the whole system is compatible with modern controls. A straightforward like-for-like swap, where the new boiler goes in the same spot as the old one using the same pipe routes, is usually quicker and cheaper than a conversion. It's worth asking directly whether your job is a swap or a conversion, since this affects both time on site and materials. ## Flue routes and condensate Every boiler needs a flue to safely remove combustion gases, and where that flue can go is governed by manufacturer instructions and building regulations, not personal preference. A flue that can exit straight through an external wall behind the boiler is the simplest and cheapest option. If the boiler needs to move, or the wall it's near isn't suitable, the flue may need to run further, sometimes vertically through a roof, which adds cost. Condensate drainage is often overlooked but matters just as much. All modern condensing boilers produce an acidic condensate that has to drain away, ideally internally to a waste pipe. Where an internal route isn't available, external condensate pipes need insulating and protecting against freezing, which can mean pipe boxing or trace heating, again adding a bit to the job. ## Controls and thermostats A new boiler is a good moment to review your heating controls. A basic like-for-like swap of a room thermostat costs little in comparison to a full upgrade to a smart thermostat with weather compensation or zoning, which involves extra wiring and setup. Controls also affect how well the new boiler performs, since poor or outdated controls can leave an efficient boiler working harder than it needs to. This is worth discussing at quote stage, since assuming the old thermostat is being kept can mean missing a small upgrade that makes a real difference to comfort and running costs. ## Making good Any job involving new pipework, a different boiler location or the removal of tanks and cylinders will leave some disruption behind, whether that's holes in plasterboard, patches of wall where a cylinder used to sit, or floorboards lifted to run pipework. Making good, meaning basic patching and tidying so the area is left presentable, should be part of a proper installation, though full redecoration typically isn't included. It's worth clarifying with any installer exactly what 'making good' means for your job specifically, since expectations can vary and this is a common source of confusion after the work is finished. ## How a boiler survey works A proper quote should start with a survey, either in person or, for straightforward jobs, over the phone with photos. The engineer will want to see the current boiler and its location, the gas meter and pipe run, where the flue currently exits, and how many radiators and bathrooms the system serves. For a like-for-like swap this can be quick, but for anything involving a change of boiler type or location it's worth allowing more time so nothing gets missed. At Harrison E Jones Heating, a survey is used to confirm the correct output, the flue route, and whether any conversion work is needed, before a fixed written price is put together. This is what allows the price agreed at quote stage to hold on the day, rather than changing once work is underway. ## Mains pressure and flow rate Combi boilers depend on decent mains water pressure and flow to deliver good hot water at the taps and shower. In parts of Merseyside with older mains connections or long, narrow supply pipes, flow rate can be lower than expected, which affects which combi output actually makes sense for a property. This is checked as part of a proper survey rather than assumed. Where mains flow is genuinely too low for the household's hot water demand, a system boiler with a cylinder may suit the property better than a combi. ## How long does a new boiler installation take? A straightforward like-for-like combi swap typically takes around a day. Jobs involving a change of boiler type, a new boiler location, or removal of an old cylinder and tanks usually take longer, often one to two days, to allow time for pipework changes, flue routing and making good. Immediate installation is available where the job allows it, which matters when a boiler has broken down and there's no heating or hot water in the meantime. A price that looks low but assumes far less time on site than the job needs is worth questioning. ## What a fitted price should include At Harrison E Jones Heating, new boilers are fully fitted from £1,299, with a fixed written price agreed before any work starts, so there are no surprises on the day. Every new boiler installation includes a FREE Gas Safety Certificate, and we fit trusted brands including Vaillant, Worcester Bosch, Baxi, Heatline and Main. A fair fitted price should cover removal of the old boiler, installation and commissioning of the new one, all necessary pipework and flue work for that specific job, basic making good, and the paperwork you need afterwards. If a quote looks unusually low, it's worth checking exactly what's included, since gaps often show up later as extra charges. ## Where to go next - new boiler prices in Liverpool - combi boiler installation across Merseyside - system boiler installation in Liverpool - boiler installation in Widnes - boiler replacement in Knowsley - boiler installer covering St Helens ## Frequently Asked Questions Why do boiler quotes vary so much between companies?Quotes differ because jobs differ. Boiler type, output, flue route, whether the system needs converting and what controls are included all affect the price, and companies don't always price for the same scope of work. Is a cheaper quote always a worse deal?Not necessarily, but it's worth checking exactly what's included. A fixed written price should set out what work is covered so you can compare like with like. Do I need to change my boiler type when I replace an old one?Not always. Many replacements are straightforward like-for-like swaps. A conversion to a different boiler type is only worth considering if it better suits your household's hot water needs. What's included with a new boiler installation from Harrison E Jones Heating?New boilers are fully fitted from £1,299 with a fixed written price agreed upfront, and every installation includes a FREE Gas Safety Certificate. How quickly can a new boiler be fitted if mine has broken down?Immediate installation is available where the job allows it. Get in touch on 07523 738285 or 0151 384 5908 and we'll talk through timing based on your boiler and property. Will a survey be needed before I get a price?Yes, a survey, in person or over the phone with photos for simpler jobs, is used to confirm output, flue route and any conversion work, so the fixed written price you're given holds on the day. Does low mains water pressure rule out a combi boiler?Not always, but it does affect which output and setup suits your home. This is checked at survey stage, and a system boiler with a cylinder may be recommended if mains flow is genuinely limited. Related services - New Boiler in Liverpool - Boiler Installation in Liverpool - Combi Boiler Installation in Liverpool - System Boiler Installation in Liverpool Speak to an engineer Mon–Sun, 8:30am–5:30pm 07523 738285 Your next step ## Get Your Fixed Price in Writing - 25 Bardley Cres, Tarbock Green, Liverpool L35 1RJ - 07523 738285 · 0151 384 5908 - info@harrisonejonesheating.co.uk - Mon–Sun, 8:30am–5:30pm ### Request your free fixed price Takes under a minute. No pushy sales visit, no obligation. Or call us direct on 07523 738285 · 0151 384 5908 Gas Safe registered heating and boiler engineers serving Liverpool, Knowsley, Halton, St Helens and the wider Merseyside area. 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