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Install a flueless gas fire.
Catalytic converter gas fire — for homes without a chimney, with proper ventilation and Gas-Safe sign-off.
✓ Updated May 2026✓ Free quotes✓ Vetted pros
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Inadequate ventilation
Failed installations skip the air vent. Trapped CO2 makes room uncomfortable.
Small room overheating
3kW in small bedroom (under 40 m³) inadequate ventilation. Room size critical.
Catalytic converter degradation
Catalytic surface contaminated by airborne particles. Annual service essential.
Cheap unit poor flame
Generic flueless fires give weak flame effect. Burley or Gazco much better.
Costs & timeline
Know what it costs. Know when it ends.
Indicative UK ranges and what affects price.
Cost range
By job type
Inc. VAT · 2026
Source: NMT quotes
Source: NMT quotes
Flueless gas fire supply2.5–3 kW typical
£800–£2.5k
Air vent installationExternal wall vent
£150–£400
Gas connection (10mm copper)From existing gas pipe
£200–£500
Gas Safe install labour1 day
£250–£500
Carbon monoxide alarmMandatory
£20–£50
Flueless suite (fire + surround)Complete unit
£1.8k–£4.5k
!
Quote spread is typically ± 18% — always get 3 quotes.
At a glance
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Flueless gas fires install without a chimney — combustion gases pass through catalytic converter and emerge as CO2 and water vapour. Expect to pay £1,200–£3,500 for UK flueless gas fire installation.
What Does the Work Involve?
Gas Safe engineer surveys room — minimum room size requirements. Air vent or trickle vent installed (typically 100mm × 100mm permanent vent in external wall). Fire wall-mounted or built-in. Gas connection plumbed. Carbon monoxide alarm installed. Combustion safety tested.
Typical Costs
| Item | Low (£) | High (£) | Notes |
|---|---|---|---|
| Flueless gas fire supply | 800 | 2,500 | 2.5–3 kW typical |
| Air vent installation | 150 | 400 | External wall vent |
| Gas connection (10mm copper) | 200 | 500 | From existing gas pipe |
| Gas Safe install labour | 250 | 500 | 1 day |
| Carbon monoxide alarm | 20 | 50 | Mandatory |
| Flueless suite (fire + surround) | 1,800 | 4,500 | Complete unit |
| Bottled gas LPG flueless | 1,200 | 3,500 | Off-grid option |
How Long Does It Take?
Install: 1 day. Including air vent install: 1–2 days.
DIY or Professional?
Gas Safe registered only. Catalytic converter system requires Gas Safe annual service.
Choosing the Right Tradesperson
Gas Safe registered with flueless experience. Brands: Burley (UK), Gazco. 5–10 year warranty.
UK Regulations
Strict room size and ventilation requirements. 5,000mm² permanent vent per 100W gas input minimum. Minimum room size 40 m³ for 3kW fire. CO alarm mandatory. Annual Gas Safe service required.
Common Problems
- Inadequate ventilation: Failed installations skip the air vent. Trapped CO2 makes room uncomfortable.
- Small room overheating: 3kW in small bedroom (under 40 m³) inadequate ventilation. Room size critical.
- Catalytic converter degradation: Catalytic surface contaminated by airborne particles. Annual service essential.
- Cheap unit poor flame: Generic flueless fires give weak flame effect. Burley or Gazco much better.
Frequently Asked Questions
Flueless vs conventional gas fire?
Flueless: no chimney needed, can install anywhere, requires air vent. Conventional: uses chimney, no air vent needed (chimney provides), traditional placement.
Where can I install flueless?
Any room meeting size and ventilation requirements. Particularly useful for properties without chimney or for rooms previously without fireplace.
Is it safe?
Yes with proper ventilation and annual service. Catalytic converter neutralises CO emissions to safe CO2 levels.
How much CO2 produced?
Less than 100ppm in average use. Below safety threshold. CO alarms (sensitive to CO not CO2) ensure safety.
Can flueless heat a room?
2.5–3 kW typical output — heats 20–30 m². Supplementary heating, not whole-house solution.
Best flueless brands?
Burley (UK manufacturer, premium). Gazco (UK premium with flueless range). Avoid cheap Chinese brands.
This guide was written with AI assistance and is intended for general information only. Prices are estimates based on UK averages and may vary by region. Always get at least three quotes and consult a qualified professional before starting any work.
NEWAI Trade Assistant
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