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.

Some model cards use a related product photo for illustration. We confirm the exact heat-only model and installed scope in the written quote.

Request a Heat-Only Quote View Heat Only Packages
  • Property-reviewed installationWritten model, scope and price before you book.
  • Worcester-first adviceWe will recommend Greenstar Ri where it is the right straight-swap option.
  • Written payment termsReview the confirmed quote and booking terms before paying.
  • Check the assigned engineerAsk to see their Gas Safe ID and relevant work categories before gas work.
Worcester Ri preferred for straight swaps For cylinder + loft tank homes Traditional system, tidy modern finish
Worcester Greenstar Ri heat only boiler for a traditional cylinder-backed home
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.

01

Ideal for traditional systems

Best where the home already runs with a cylinder and loft tank.

02

Like-for-like can be smarter

Sometimes the clearest upgrade is replacing it well, not redesigning everything.

03

Clear package logic

We show what is included and how the flue and filter are handled before install day.

04

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.

Worcester Greenstar Ri 12kW, 15kW, 18kW, 25kW and 30kW heat only boiler range Recommended by FlameTec

Worcester Bosch Greenstar Ri

12kW / 15kW / 18kW / 25kW / 30kW

  • Best forStraight like-for-like replacements in traditional homes keeping the regular boiler layout
  • Available sizesLower outputs for smaller regular systems, with 25kW and 30kW sizes there when the heat demand steps up
  • Why choose itReliable Worcester support, sensible replacement logic and a proper workhorse reputation
  • Good fitHomes where the cylinder and loft tank setup already works and does not need forced redesign
Compare Worcester Ri
Internal view of the Worcester Greenstar Ri heat only boiler Best for clean straight swaps

Why it suits many regular homes

Strong fit for straight swaps

  • Straight swap fitIt suits homes that simply need a proper regular boiler replacement done right
  • Long-term supportStrong parts availability and a familiar Worcester platform for future servicing and support
  • Layout matchWorks well where the cylinder and loft tank setup already suits the home
See Worcester Guide

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.

Glow-worm Energy Regular 12R, 15R, 18R, 25R and 30R heat only boiler packages Core range

Glow-worm Energy Regular

12R / 15R / 18R / 25R / 30R

  • Best forRegular boiler replacements across smaller homes, typical family homes and larger traditional layouts
  • Available sizes12R and 15R suit compact systems, while 18R, 25R and 30R suit the stronger radiator-count side of the range
  • IncludedBoiler, horizontal flue, Glow-worm filter, installation and registration
  • Why choose itCompact cupboard-fit shell, straightforward value and a clean range to compare from one card

Model, installed scope and price are confirmed after a property review.

See Energy Regular Sizes
Illustrative Glow-worm Energy7 heat-only boiler image; Ultimate3 model is confirmed in the quote Premium heat only

Glow-worm Ultimate3 Regular

25R

  • Best forHigher-demand traditional homes wanting a step-up regular boiler option
  • IncludedBoiler, horizontal flue, Glow-worm filter and registration-ready package logic
  • Why choose itPremium regular option with higher-demand positioning

Model, installed scope and price are confirmed after a property review.

Request a Quote

Alpha E-Tec regular packages

Compact Alpha heat only options for value-led replacements.

We confirm the exact Alpha heat-only model, compatible flue, filter and installation scope after checking the property and supplier availability.

Illustrative Alpha E-Tec NX combi boiler image; heat-only model is confirmed in the quote Full Alpha range

Alpha E-Tec Regular

15R / 20R / 25R

  • Best forCompact to medium regular boiler systems, with 25R there when the heating demand steps up
  • Manufacturer termsApplicable terms for the selected model are confirmed in writing.
  • Available sizes15R for smaller systems, 20R for the all-round middle ground, and 25R for stronger heating demand
  • Why choose itStainless steel heat exchanger in a compact cupboard-fit shell with simple Alpha value logic

Model, installed scope and price are confirmed after a property review.

Compare Alpha Sizes

Baxi heat only alternatives

Three Baxi tiers if Worcester Ri is not the option you want to take.

Flue and filter requirements vary by model and the existing system. We confirm the selected Baxi model and what is included in the written installation quote.

Baxi 400 Heat heat only boiler range Budget tier

Baxi 400 Heat

15kW / 18kW / 24kW / 30kW

  • Manufacturer termsApplicable terms for the selected model are confirmed in writing.
  • Best forBudget-aware regular boiler swaps that still want a clear branded option
  • Why choose itLightweight 17.4kg body, no pump overrun and rear flue option

Model, installed scope and price are confirmed after a property review.

See 400 Heat Options
Baxi 600 Heat heat only boiler range Mid-range tier

Baxi 600 Heat

16kW / 19kW / 25kW

  • Manufacturer termsApplicable terms for the selected model are confirmed in writing.
  • Best forHomeowners wanting a stronger all-round Baxi regular boiler package
  • Why choose itQuiet running, easy install design and a clear step up from the 400 tier

Model, installed scope and price are confirmed after a property review.

Compare 600 Heat
Baxi 800 Heat heat only boiler range Premium tier

Baxi 800 Heat

16kW / 19kW / 25kW / 30kW

  • Manufacturer termsApplicable terms for the selected model are confirmed in writing.
  • Best forPremium-minded regular boiler replacements staying with the Baxi platform
  • Why choose itErP A rated with the Adey MagnaClean filter already included by the manufacturer bundle

Model, installed scope and price are confirmed after a property review.

View 800 Heat

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 care 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.

System care 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

We review the installation scope and explain commissioning, handover and any registration requirements. Check the assigned engineer's Gas Safe ID and relevant work categories before gas work.

Quote and booking terms

Review the heat-only quote and terms before paying.

We check the boiler size, installation scope and property details before confirming the total quote. You can review the written booking terms before any payment.

Match the boiler to the home

Start with the correct boiler size and installation scope.

Clear written quote

Review the confirmed model, scope and total price before booking.

Manufacturer terms

We confirm the applicable terms for the selected model in writing.

Request a Heat-Only Quote Ask About Booking Terms

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.

Request a Heat-Only Quote Compare System Boilers

Property-reviewed installation | Scope and payment terms confirmed in writing