Ideal for traditional systems
Best where the home already runs with a cylinder and loft tank.
FlameTec Boilers
Heat Only Boiler Installation
Heat only boilers are built for homes with a hot water cylinder and a cold water tank. If your property already suits that traditional setup, a like-for-like regular boiler replacement is often the clearest answer, and Worcester Greenstar Ri is usually the first boiler we want in the conversation.
- Fixed-price installationClear package pricing before you book.
- Worcester-first adviceWe will recommend Greenstar Ri where it is the right straight-swap option.
- Finance availableSelected packages can show spread-the-cost options during checkout.
- Installed by Gas Safe engineersCommissioned correctly with the right handover and registration.
Worcester Ri preferred for straight swaps
For cylinder + loft tank homes
Traditional system, tidy modern finish
Preferred heat-only option: Worcester Greenstar Ri
We still quote Alpha, Glow-worm and Baxi options where they better suit the budget or brief.
Best suited to
Homes already built around a hot water cylinder, a cold water tank, and a regular boiler layout that still makes practical sense to keep without forcing a conversion.
Like-for-like can be smarter
Sometimes the clearest upgrade is replacing it well, not redesigning everything.
Clear package logic
We show what is included and how the flue and filter are handled before install day.
Engineer-led support
Local, tidy, trustworthy installation without a faceless call-centre feel.
What is a heat only boiler?
A heat only boiler keeps the home on a traditional cylinder-backed setup.
A heat only boiler, also called a regular boiler, heats your radiators and works with a hot water cylinder. It is designed for homes that still rely on a cold water storage tank and do not need a full change to a combi or sealed system setup.
Works with a cylinder
Stored hot water stays part of the system, which suits many traditional homes.
Built for older layouts
Often the sensible answer where the pipework and wider system already suit regular boiler replacement.
Less disruption
A like-for-like swap can avoid unnecessary conversion work when the existing arrangement still fits the home.
Is a heat only boiler right for my home?
Usually yes if the home already suits a regular boiler layout.
Regular boilers are often the cleanest option when the home is already built around a cylinder and loft tank.
Traditional family homes
Good fit where the heating system was designed around a regular boiler from the start.
Homes with a loft tank
If the tank and cylinder are staying, a heat only boiler is often the cleanest replacement path.
Customers avoiding conversion work
Useful when the brief is simple: replace it well, keep disruption down, and move on with a tidy install.
Properties with stored hot water demand
A practical answer where the home already depends on stored hot water rather than instant combi performance.
Worcester heat-only option
Worcester Greenstar Ri is a strong regular-boiler choice for straightforward replacements.
When the home is staying on a traditional cylinder-backed layout, Worcester Ri is a dependable like-for-like option.
Recommended by FlameTec
Best for clean straight swaps
Alternative heat-only package options
Glow-worm packages if you want something different from Worcester.
These installed figures use public supply baselines and our standard natural gas package logic. For Energy Regular, the public baseline is the horizontal flue pack and the included filter is handled inside the FlameTec installed package price.
Core range
Glow-worm Energy Regular
12R / 15R / 18R / 25R / 30R
Installed price
£1,999
12R package basis with flue pack public baseline and filter included in our install pricing; 15R, 18R, 25R and 30R sizes are also available
Finance example
£28.56/mo
10 years at 11.9% APR representative, subject to status
Premium heat only
Glow-worm Ultimate3 Regular
25R
Installed price
£2,220
25R horizontal flue + filter package basis
Finance example
£31.72/mo
10 years at 11.9% APR representative, subject to status
Alpha E-Tec regular packages
Compact Alpha heat only options for value-led replacements.
Alpha E-Tec Regular packages use the verified public boiler baseline and then add the horizontal flue, magnetic filter, standard fitting sundries, and registration inside the installed package price.
Full Alpha range
Alpha E-Tec Regular
15R / 20R / 25R
Installed price
£1,832
15R boiler baseline with flue + magnetic filter package logic; 20R and 25R sizes are also available
Finance example
£26.18/mo
10 years at 11.9% APR representative, subject to status
Baxi heat only alternatives
Three Baxi tiers if Worcester Ri is not the option you want to take.
Baxi 400 and 600 packages include the horizontal flue and magnetic filter inside the FlameTec install price. Baxi 800 packages still include the flue in our pricing, but the filter is already built into the manufacturer-backed product bundle so we do not double-add it.
Budget tier
Baxi 400 Heat
15kW / 18kW / 24kW / 30kW
Installed price
£1,920
15kW package basis with flue + magnetic filter in the FlameTec install price
Finance example
£27.43/mo
10 years at 11.9% APR representative, subject to status
Mid-range tier
Baxi 600 Heat
16kW / 19kW / 25kW
Installed price
£2,341
16kW package basis with flue + magnetic filter included in our install pricing
Finance example
£33.45/mo
10 years at 11.9% APR representative, subject to status
Premium tier
Baxi 800 Heat
16kW / 19kW / 25kW / 30kW
Installed price
£2,141
16kW package basis; filter is already included so we do not double add it
Finance example
£30.59/mo
10 years at 11.9% APR representative, subject to status
Heat only sizing guide
A simple guide to matching output to radiator count.
We use this as a clean first filter before checking the full property, cylinder layout and hot water demand in more detail.
12kW
Around 6 radiators
15kW
Around 8 radiators
18kW
Around 12 radiators
25kW
Around 15 radiators
30kW
Around 20+ radiators
Final sizing still depends on the full property heat loss, the cylinder arrangement, and overall hot water demand.
Why choose FlameTec for regular boiler replacement?
Premium install standards for a boiler type that still deserves proper workmanship.
Heat only boiler replacement is not a second-tier job. The advice, cleanliness, controls setup, system protection and handover all still matter, especially on older or more traditional systems.
We keep the system logic sensible
If a like-for-like regular boiler swap is smarter than a conversion, we say so and package it clearly.
Protection is built into the package
Flue and filter inclusion is handled deliberately so the installed package makes sense, not just the supplier line item.
Tidy, trustworthy installation
Gas Safe engineers, proper commissioning, correct registration and a neater final finish than you usually expect from an old-school boiler change.
Spread the cost
Finance available on selected heat only packages.
If you want to spread the cost, we show eligible finance options clearly during checkout. That means you can compare the right heat-only package first and then decide whether finance helps you move faster.
Fixed package first
Start with the correct boiler size and package before you think about payment options.
Clear finance journey
Where available, the finance option is shown clearly. Terms apply and finance is subject to status.
Useful for higher-tier packages
Especially helpful if you are comparing longer-warranty or premium heat only package levels.
Heat only boiler FAQs
Straight answers before you choose the package.
If the home is staying with a regular boiler layout, these are the questions that usually matter most.
What is the difference between combi, system and heat only?
A combi makes hot water on demand and does not need a cylinder. A system boiler works with a hot water cylinder on a sealed system. A heat only boiler works with a cylinder and usually a loft tank on a more traditional setup.
Do I need a cylinder with a heat only boiler?
Yes. A heat only boiler is designed to work with stored hot water, so the cylinder remains part of the system.
Can I replace my old regular boiler like-for-like?
Very often, yes. If the wider layout still makes sense, a like-for-like regular boiler replacement is often the neatest and least disruptive option.
Is the flue included?
Yes, the package is built around including the required flue. On some public supplier baselines the flue is already part of the pack, and on others we add it inside the FlameTec installed package pricing.
Is the filter included?
Yes. Where the manufacturer already includes the filter, we do not add it again. Where the public supplier baseline is boiler-only or flue-only, we build the filter into the installed package price.
How do I choose the right size?
The quick guide is radiator count, but final sizing also depends on the property heat loss, cylinder arrangement and hot water demand. We use your quote details and photo checks to confirm the final fit.
Ready to compare?
Build your heat-only boiler quote and keep things clear from the start.
If a regular boiler replacement is the right answer, we will package it clearly. If the home would be better served by a system or combi setup, we will say that before you commit.
Fixed-price installation | Flue + filter included | Finance available on selected packages, subject to status