New Combi Boiler Installation — From £1,699 Fully Fitted

What You Get With a New Combi Boiler Installation

Every new combi boiler installation from Next Gen Boilers Ltd is a complete, all-inclusive service:

• Brand new A-rated combi boiler from Worcester Bosch, Baxi, Alpha or Viessmann
• Free Hive smart thermostat — app-controlled heating from your phone
• Free MagnaClean magnetic filter — protects your new boiler from sludge and scale damage
• Free chemical system flush — removes existing debris from your heating system
• Safe removal and disposal of your old boiler
• Gas Safe registered installation with full certification provided
• Up to 10 year manufacturer warranty registered on your behalf
• System testing and commissioning — we don't leave until everything is working perfectly

New Combi Boiler Prices — What to Expect

Our new combi boiler installation prices start from just £1,699 fully fitted. Here's a general guide to what you can expect to pay:

• Alpha E-Tec Plus / Baxi 400 — From £1,699 fitted (great for flats and smaller homes)
• Baxi 800 / Worcester Bosch Greenstar 4000 — From £1,799–£1,899 fitted (ideal for most 3-bed semis)
• Viessmann Vitodens / Worcester Bosch Greenstar 8000 — From £1,899–£2,299 fitted (premium efficiency for larger homes)

All prices include full installation, free Hive thermostat, free magnetic filter, free chemical flush, old boiler removal and Gas Safe certification. No hidden extras — what we quote is what you pay.

We also offer 0% interest-free finance to help spread the cost. Payments from around £29/month (subject to status).

Why Choose Next Gen Boilers Ltd for Your New Combi Boiler?

Hundreds of Manchester homeowners choose us for their new combi boiler installation. Here's why:

• Fixed prices from £1,699 — all-inclusive, no surprises
• Free Hive thermostat included — worth up to £150, included at no charge
• Next-day installation available — we won't leave you without heating
• 10 year warranties available on selected boilers
• Gas Safe registered engineers — fully qualified and insured
• 24 hour emergency call outs — we're here when you need us
• Finance options — spread the cost from around £29/month
• Local company — based in Irlam, serving the whole of Greater Manchester

The Best New Combi Boilers in 2024/25

We've tested and installed thousands of boilers. These are the models we trust most for Manchester homes:

• Worcester Bosch Greenstar 4000 — The UK's most popular combi boiler. Outstanding reliability, quiet operation and up to 10 year warranty. The go-to choice for most 3-bed homes. From £1,899 fitted.
• Baxi 800 Combi — Excellent value and performance with a user-friendly display. 10 year warranty available. From £1,799 fitted.
• Alpha E-Tec Plus — Compact, lightweight and affordable. Perfect for flats and smaller homes. From £1,699 fitted.
• Viessmann Vitodens 050-W — German precision engineering with a stainless steel heat exchanger for exceptional longevity. From £1,899 fitted.

How Long Does a New Combi Boiler Installation Take?

Most new combi boiler installations — including a straight swap on an existing combi — are completed within a single day. If you're converting from a conventional boiler system with a separate cylinder and loft tanks, the job may take slightly longer, but our engineers will give you a clear timeline in advance.

We offer next-day installation across Manchester, Salford, Irlam, Eccles, Trafford and surrounding areas. Call 07305 687 331 to confirm availability. We aim to have your new combi boiler up and running as quickly as possible — leaving you warm, comfortable and with full hot water.

Your New Combi Boiler Installation Day — What Happens Hour by Hour

Not knowing what to expect on installation day is one of the most common concerns homeowners raise before booking. Here is exactly what happens when our engineers arrive at a typical Manchester property for a combi boiler installation:

• 8:00–8:30am — Arrival and introduction: The engineer introduces themselves, confirms the scope of work and fixed price, and does a brief walk-around to identify gas meter, stopcock, existing pipework routes and where the flue will exit. Dust sheets are laid in all working areas.
• 8:30–9:30am — Old boiler isolation and draining: The existing boiler is isolated from the gas supply and power. The system is drained down. If the old boiler is in a loft or airing cupboard, now is when cold water tanks and cylinder are disconnected too (for system-to-combi conversions).
• 9:30–11:00am — Old boiler removal and new boiler positioning: The old unit is carefully removed and set aside for disposal. The new boiler is positioned and mounted on the wall. New boiler connections are made to existing pipework where possible — reducing waste and fitting time.
• 11:00am–12:30pm — Chemical flush and magnetic filter installation: Before connecting the new boiler, we flush the existing system with a professional-grade chemical inhibitor to remove any sludge, magnetite or debris. The MagnaClean magnetic filter is installed on the return pipe to capture ongoing particulates.
• 12:30–2:00pm — Flue installation and gas connection: The flue is routed through the external wall (or extended if the old flue position is retained). Gas connection is made and tested for tightness by the engineer using their gauge — this is a formal Gas Safe requirement documented on the commissioning record.
• 2:00–3:00pm — Commissioning and testing: The new boiler is fired up and run through a full commissioning sequence. All radiators are bled and balanced. Hot water flow and temperature are tested. The engineer carries out a flue gas analysis to confirm combustion efficiency and check for any CO. All safety devices are verified.
• 3:00–4:00pm — Thermostat setup and customer handover: The Hive smart thermostat is installed and configured, the app is set up on your phone (if you have a smartphone), and the engineer walks you through how to use your new boiler and thermostat controls. All paperwork is handed over — Gas Safe certificate, warranty registration confirmation, and service record.

Most standard like-for-like combi swaps finish earlier than this. Conversions from older system or conventional boilers may take longer.

After Installation — Your First Week With a New Combi Boiler

Once your new combi boiler is installed, here is what to watch for in the first few days:

• Pressure check (day 2–3): It is normal for a newly installed boiler to drop from 1.5 bar to around 1–1.2 bar in the first couple of days as the system settles and small air pockets work out. If it drops below 1 bar, follow the repressurise instructions on the boiler casing (or call us — we will walk you through it over the phone). If pressure drops again quickly, call us — there may be a small leak to investigate.
• Bleeding radiators: Some radiators may have cold spots or feel slightly uneven in the first week as residual air escapes. Bleed any cold-topped radiators with a radiator key — this is normal and not a fault.
• Checking the Hive app: Make sure the Hive thermostat has connected to your router and the app is showing live data. If it is not, try cycling the boiler off and on once. If still not connecting, call Hive support — app connectivity is a network issue, not a boiler fault.
• Hot water temperature: Your new combi should deliver hot water at 35–60°C within 10–30 seconds of opening the tap (quicker than your old boiler). If it is taking significantly longer or the temperature is inconsistent, call us — this is unusual and we will investigate.
• Annual service reminder: Mark your calendar for the same month next year. Annual boiler servicing is essential to maintain the manufacturer warranty and keep your boiler running efficiently. We send service reminders automatically.

How to Choose the Right Combi Boiler Output for Your Manchester Home

Combi boilers come in different output ratings (measured in kW) and choosing the right size is critical — too small and hot water pressure will disappoint; too large and you pay more for a boiler that never works at full capacity. Here is our sizing guide for typical Greater Manchester homes:

• Up to 24kW — 1-bed flat or small 1–2 bed terrace: A 24kW combi is sufficient for a property with one bathroom, one shower, and low simultaneous hot water demand. The Alpha E-Tec Plus 24kW or Worcester Bosch Greenstar 4000 24kW are ideal here, from £1,699–£1,899 fitted.
• 28–30kW — The standard choice for most 3-bed semis: The most common size in Greater Manchester. Suitable for a 3-bedroom semi with one main bathroom, one en-suite or separate shower, and typical simultaneous demand. The Worcester Bosch Greenstar 4000 28kW, Baxi 824, or Viessmann Vitodens 050-W 26kW all work excellently here.
• 32–35kW — Larger homes or high hot water demand: For 4+ bedroom properties, homes with two full bathrooms both in frequent simultaneous use, or where the property has a large bath (over 200 litres) that needs filling quickly. The Worcester Bosch Greenstar 4000 32kW or 8000 Life 30kW handles this comfortably.

Our engineers will assess your property's specific hot water demand before recommending a size — including counting radiators, checking the gas supply pipe diameter, and discussing how you use hot water. This assessment is included in every installation quote at no extra charge.

Compare combi boiler installation in Manchester — or use our instant quote tool to see your exact fixed price in 60 seconds.

Frequently Asked Questions