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Boiler Installation Portsmouth

Fixed-price boiler installation in Portsmouth (PO1, PO4 and PO5), serving Southsea, Fratton, Eastney and Old Portsmouth. Start with an online quote for boiler replacement today.

Next-day installation slots
Up to 12-year warranty
Gas Safe registered engineers
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Reliable Boiler Installation & Replacement in Portsmouth

Portsmouth’s Portsea Island is one of the most densely built places in England, with long rows of Victorian two-up two-down terraces and Regency-style villas in Southsea. These tight layouts shape many of the boiler installations we carry out across PO1, PO4 and PO5, so we survey flue routes and access first and avoid costly relocations.

Portsmouth Water supplies very hard chalk water, and salt-laden winds off the Solent attack external flues and fittings, so both limescale and corrosion matter here. On every installation in PO3 and PO6 we flush the system, fit a magnetic filter, use durable terminals and recommend scale protection for your new boiler.

Whether you’re replacing an old back boiler in Fratton, upgrading to a combi in Southsea or fitting a system boiler in a large Cosham house, our Gas Safe engineers commission every installation and register the warranty, so your Portsmouth boiler runs efficiently from day one.

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Why Replace Your Old Boiler in Portsmouth

Many of the boilers we replace in Portsmouth are 12 to 15 years old or more, fitted when houses were converted into flats and left alone since.

Solid-wall brick terraces and flat-fronted Victorian streets lose heat quickly, so an inefficient boiler burns far more gas to keep rooms warm through damp, windy seaside winters.

Southsea and Fratton have many converted flats and shared houses, so heavily used older boilers there are among the most common winter breakdown call-outs we attend across PO4 and PO5.

Southsea’s conservation areas and Old Portsmouth’s historic streets have listed buildings, so we plan flue terminals carefully and advise where the council or a freeholder must approve the work.

Many older Portsmouth terraces and flats still use regular boilers with loft tanks that can freeze or leak in cold snaps. Switching to a combi removes those tanks, frees up loft and cupboard space and gives instant hot water whenever you turn on the tap.

A modern A-rated boiler uses less gas, works with smart heating controls and carries a manufacturer warranty of up to 12 years, keeping Portsmouth households warmer with fewer repairs.

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Our Best-Selling Boiler Packages in Portsmouth

Browse our most popular boiler installation packages, selected to suit different property sizes, hot-water requirements and budgets in Portsmouth.

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Areas We Cover

We provide home energy installations nationwide, helping families across the UK upgrade their heating and energy systems. With next-day installation slots often available, getting started couldn’t be easier.

We have major hubs in Wales, London and the Midlands. Our accredited engineers deliver a fast, reliable service wherever you live. You can get a quote online today using our streamlined system, and we’ll match you with an engineer in your local area.

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How Much Does a New Boiler Cost in Portsmouth?

In Portsmouth, a like-for-like combi replacement usually costs between £1,800 and £3,500 fully installed, depending on the brand and output. This covers most terraces and flats in Fratton, Southsea and Eastney, where the new boiler stays in the same position.

For a system or regular boiler, found in larger homes in Cosham, Drayton and Farlington, expect around £2,200 to £4,000, particularly if the cylinder or loft tank also needs replacing.

Converting from a tank-fed system to a combi, removing a back boiler or working in a listed or seafront property with restricted access typically costs £3,000 to £5,000. EazyHeat provides a fixed, itemised quote before any work begins.

We itemise your Portsmouth quote from the boiler and flue through to controls, labour and commissioning, so there are no hidden extras, and the fixed price we agree at the start is what you pay once the installation is complete.

Choosing the Right Boiler When Replacing Your Old Gas Boiler in Portsmouth

When it comes to replacing an existing gas boiler, you have several options depending on your home, lifestyle, and budget in Portsmouth.

Combination Boilers (Combi) Portsmouth

  • Heat your central heating and hot water directly from one compact unit.
  • No separate hot water cylinder needed.
  • Best suited to Fratton or Eastney terraces and households with one bathroom.
  • Highly energy-efficient, with minimal heat loss.

Ideal for: compact terraces, flats and small to medium homes in areas like Southsea and Buckland.

System Boilers Portsmouth

  • Take water directly from the mains and store it in a hot water cylinder.
  • Provide a constant supply of hot water to multiple taps at once.
  • More suited to larger Cosham or Farlington homes with higher hot water demand.

Ideal for: Families with multiple bathrooms in larger PO6 and PO3 homes and households with heavy daily hot water use.

Regular Boilers (Conventional) Portsmouth

  • Also known as traditional or heat-only boilers, still common in older Portsmouth terraces and flats.
  • Use a separate hot water cylinder and cold water storage tanks, typically in the loft space.
  • Best for homes with an existing tank-fed setup in Drayton or Southsea.

Ideal for: Larger detached homes in PO6 or PO3 already configured for a regular boiler, or with high hot water needs.

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Flexible ways to pay

Choose from a range of convenient payment options, including flexible finance plans or paying for your installation in full.

Flexible Monthly Repayments

Representative APR 11.9% (fixed)

Spread the cost of your installation over a longer repayment term with manageable monthly payments.

As long as your scheduled monthly payments are maintained, you can make additional payments at any time. Overpayments may help reduce the total interest charged and shorten the length of the agreement.

You will also receive the additional protections provided by the Consumer Credit Act 1974.

Representative example: Cash price £2,000. No deposit required. Total amount of credit £2,000. Interest rate 11.9% per annum fixed. Representative APR 11.9%. Agreement term 60 months. 60 monthly payments of £43.78. Total amount repayable £2,627.08.

Cash, Card or Bank Transfer

Pay for your installation in full

Choose from several convenient ways to pay for your installation:

  • Make an online bank transfer to Eazy Heat Ltd. using the bank details shown on your invoice. This is our preferred payment method.
  • Make a card payment over the phone through our office.
  • Make a cash payment after your installation has been completed.
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We act as an introducer appointed representative of Vendigo, we’ll never quote you real time rates. We’ll simply send you a link to apply for finance from them.

EAZY HEAT LTD (FRN: 1020736)] is an Appointed Representative of Koze Group Ltd, a credit broker, not a lender. Koze Group Ltd is authorised and regulated by the Financial Conduct Authority (FRN 811281) and registered in England (08357963). We offer finance products from a panel of lenders. Credit is subject to age and status.

Why Choose EazyHeat?

At EazyHeat, we don’t just install systems. We provide a complete, customer-focused experience that puts speed, simplicity, and service first. Homeowners across the UK choose us for:

Fast Turnaround Times

Choose your install date, and we’ll do the rest. No drawn-out processes or unnecessary delays.

12-Year Warranty as Standard

All boiler installations come with a market-leading 12-year parts and labour warranty.

Highly Rated Service

We’re proud of our reputation. From initial quote to final handover, we deliver consistently top-rated service across the UK. That’s why we’re rated Excellent on Trustpilot!

Gas Safe Registered Installers

Every job is carried out to the highest safety standards by our fully qualified, experienced engineers.

UK-Wide Coverage

No matter where you’re based, we’ve got expert installers ready to help – from major cities to rural towns.

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What Our Customers Are Saying

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Boiler Installation FAQs

Yes. Compact Portsea Island terraces are a regular part of our work. We plan the flue route through a rear wall or roof, size the boiler for a small kitchen and protect your home throughout, keeping disruption to neighbours to a minimum.

They can. Flue terminals on front elevations in conservation areas or listed buildings may need consent, and leasehold flats may need freeholder approval. We suggest discreet rear or roof terminals first and help you contact Portsmouth City Council if approval is needed, so your installation stays compliant.

Portsmouth’s very hard water leaves limescale on heat exchangers and pipework, which reduces efficiency and shortens boiler life. We flush the system, fit a magnetic filter and can add scale protection. Annual servicing protects your manufacturer warranty.

A like-for-like combi swap in a typical Portsmouth terrace or flat takes 4 to 6 hours. Removing a back boiler or converting a Southsea villa from a regular system usually takes a full day, occasionally running into the next morning for commissioning. We tidy up fully and explain your new controls before we leave.

Alongside Portsmouth city centre, we install boilers in Southsea, Fratton, Eastney, Cosham, Drayton, Farlington and Buckland, as well as Havant and Gosport. If you are just outside the PO postcodes, we also cover nearby Southampton, Chichester and Winchester. We regularly work across Hampshire.

Speak With Our Boiler Experts

For personal guidance about your property or installation, call EazyHeat on 0330 133 5170.

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