Assess First. Recommend Second.
A combi replacement range with Easy-Fill 2 and seven-year conditional cover.
CH means central heating; DHW means domestic hot water. Nominal model labels are shown separately from verified ratings. Gas CH maximum/minimum values use the non-condensing basis; a second maximum is shown only where a verified condensing rating is available. The source basis below controls the comparison. No missing value is calculated from another variant.
| Model / fuel | Nominal label (kW) | CH maximum (kW) | DHW output (kW) | CH minimum (kW) | DHW at ΔT 35°C |
|---|---|---|---|---|---|
| Baxi 624 Combi 2 · Natural gas | 24 | 20 / 21.8 condensing | 24 | 4.8 | 10.2 l/min |
| Baxi 624 Combi 2 · LPG | 24 | 20 / 21.8 condensing | 24 | 4.8 | 10.2 l/min |
| Baxi 630 Combi 2 · Natural gas | 30 | 25 / 27.1 condensing | 30 | 5.8 | 12.2 l/min |
| Baxi 630 Combi 2 · LPG | 30 | 25 / 27.1 condensing | 30 | 5.8 | 12.2 l/min |
| Baxi 636 Combi 2 · Natural gas | 36 | 25 / 27.1 condensing | 36 | 7.2 | 15 l/min |
| Baxi 636 Combi 2 · LPG | 36 | 25 / 27.1 condensing | 36 | 7.2 | 15 l/min |
Easy-Fill 2 provides a permanent filling link. Baxi lists brass hydraulics, a stainless steel heat exchanger and compatibility with its Easy-Flue system.
The 624 has a different heating rating from the 630 and 636; the latter two share a heating maximum but differ in hot-water output.
A combi may suit a home where on-demand hot water can meet the household’s routines without a separate cylinder. Measured mains flow and dynamic pressure limit performance, particularly when outlets run together. Bathroom count alone does not confirm suitability.
Up to 7 years, subject to Baxi terms, product eligibility, registration, commissioning and annual servicing. The eligible installation package is confirmed in your written quotation.
Manufacturer warranty, SwiftHeat installation cover and qualifying Care+ services are separate. Keep the required registration, commissioning and service records. Your quotation confirms the exact terms before purchase.
Manufacturer warranty information · Ongoing servicingBaxi identifies uSense control compatibility for the current combi range. Confirm the exact controller generation and any gateway/adaptor kit required.
The LPG rows are verified compatible configurations, not separate universal conversion instructions. Fuel conversion and commissioning must follow the exact manufacturer manual.
Discuss heating controlsAssess gas supply, flue route, condensate disposal, heating water quality, controls and future service access. The casing dimensions alone cannot approve a cupboard installation.
A same-arrangement replacement, relocation and conversion involve different work. SwiftHeat confirms the appliance and complete installation scope after survey. Assess First. Recommend Second.
The guide separates nominal model labels from verified heating output and rated hot-water output. Non-condensing and condensing ratings use different operating conditions. A heat-loss calculation and installation assessment are still required.
Up to 7 years, subject to Baxi terms, product eligibility, registration, commissioning and annual servicing. The eligible installation package is confirmed in your written quotation.
Baxi lists natural gas and LPG configurations for the variants shown here. Manual conversion and commissioning by a suitably competent engineer are required; compatibility does not mean a natural-gas setup can be used unchanged. Confirm the exact generation and instructions.
Checked 1 October 2026. Availability and terms can change; the exact appliance and current instructions are confirmed again at quotation.
Official Baxi product photography and trademarks remain the property of their respective owners. Manufacturer warranty graphics do not confirm the eligibility of a SwiftHeat package.
The installed price for your selected boiler is confirmed after assessment. The quotation covers the appliance, controls, flue, system preparation and any required pipework. A conversion or relocation can have a different scope from a straightforward replacement.
New boiler installations from £1,790 inc. VAT apply to a qualifying standard, straightforward replacement: one bathroom, fewer than 10 radiators and a standard horizontal flue, subject to survey. Specification and warranty selection affect the final cost. This is a general starting offer and is not a price for every model in this catalogue.
Read the starting-package conditions0% options over 3, 6, 9 or 12 months through Humm Group Limited, subject to application, affordability, eligibility, approval and provider terms. Any applicable deposit, fees and repayment conditions are confirmed during your enquiry/application. Acceptance is not guaranteed.
Finance terms and chargesTwo free annual services and a Hive Mini are available on qualifying installations only. Every model is considered under the qualification rules; inclusion in this catalogue does not confirm eligibility. Ask us to confirm the offer in your quotation.
Ask about Care+ eligibilityPlan the maintenance your appliance requires and keep its service records. If you are considering replacement because of a fault, diagnosis can help establish whether repair is a suitable option first.
Boiler servicing · Repair advicePrice confirmed following assessment for this configuration. The general New boiler installations from £1,790 inc. VAT offer does not apply to every model or property.
From or indicative prices remain provisional. SwiftHeat issues a written fixed quotation for the agreed scope after the appropriate property and installation assessment, technical checks and warranty-package verification. Remote information gathering may be suitable initially; a home survey is required where the necessary checks cannot be completed remotely.
We assess heat loss, heating and hot-water requirements, water supply, controls and installation access before recommending an appliance. Bedroom count or a catalogue model number alone cannot establish the right boiler.
Gas Safe registration 978273 · Serving Cardiff, South Wales and across the UK.
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