400 Combi 2.1
A compact combi with three hot-water ratings and a five-year conditional warranty.
Output labels: 24, 30, 36 kW
Warranty: Up to 5 years, subject to terms
Explore 400 Combi 2.1Choose the arrangement before the model
A Baxi model number is a starting point for research, not a heating design. Compare how your home supplies hot water, the fuel available and the heat it loses before choosing between the 400, 600, 800, Assure, Compact and MainEco families.
These guides reconcile Baxi’s homeowner and professional UK directories. Platinum Compact, Duo-tec Compact and Megaflo Compact appear in the homeowner range; Assure appears in the professional specification range. MainEco and the listed electric products retain their manufacturer identities. Listings establish range coverage, not local stock or suitability.
Combi boilers
600 Combi 2
A combi replacement range with Easy-Fill 2 and seven-year conditional cover.
Output labels: 24, 30, 36 kW
Warranty: Up to 7 years, subject to terms
Explore 600 Combi 2
800 Combi 2
A combi package that adds a supplied magnetic filter and conditional ten-year warranty.
Output labels: 24, 30, 36 kW
Warranty: Up to 10 years, subject to terms
Explore 800 Combi 2
Assure 500 Combi 2
A specification-led combi range with 24, 30 and 36 kW hot-water options.
Output labels: 24, 30, 36 kW
Warranty: Up to 2 years, subject to terms
Explore Assure 500 Combi 2
Platinum Compact Combi
A Compact-generation combi with three hot-water options and a supplied system filter.
Output labels: 25, 30, 36 kW
Warranty: Up to 10 years, subject to terms
Explore Platinum Compact Combi
Duo-tec Compact Combi
A Compact-generation combi offering 25, 30 and 36 kW hot-water ratings.
Output labels: 25, 30, 36 kW
Warranty: Up to 7 years, subject to terms
Explore Duo-tec Compact Combi
MainEco Compact Combi
The MainEco Compact combi combines two hot-water options with a compact wall-mounted format.
Output labels: 25, 30 kW
Warranty: Up to 5 years, subject to terms
Explore MainEco Compact CombiSystem boilers
600 System 2
A cylinder-based system range with 15, 18 and 24 kW heating labels.
Output labels: 15, 18, 24 kW
Warranty: Up to 7 years, subject to terms
Explore 600 System 2
800 System 2
A cylinder-based range with a supplied filter and 18, 24 and 30 kW heating options.
Output labels: 18, 24, 30 kW
Warranty: Up to 10 years, subject to terms
Explore 800 System 2
Assure 500 System 2
A specification-led system range for a separately designed hot-water cylinder.
Output labels: 15, 18, 24 kW
Warranty: Up to 2 years, subject to terms
Explore Assure 500 System 2
Megaflo Compact System
A Compact-generation system boiler guide for homes retaining stored hot water.
Output labels: Awaiting verification
Warranty: Up to 7 years, subject to terms
Explore Megaflo Compact System
MainEco Compact System
The MainEco Compact system range offers 15 and 18 kW heating options.
Output labels: 15, 18 kW
Warranty: Up to 5 years, subject to terms
Explore MainEco Compact SystemHeat-only / regular boilers
400 Heat
A heat-only replacement range with top or optional in-case rear flue siting.
Output labels: 15, 18, 24, 30 kW
Warranty: Up to 5 years, subject to terms
Explore 400 Heat
600 Heat
A compact heat-only range with 16, 19 and 25 kW heating variants.
Output labels: 16, 19, 25 kW
Warranty: Up to 7 years, subject to terms
Explore 600 Heat
800 Heat
A heat-only range with a supplied magnetic filter and four heating outputs.
Output labels: 16, 19, 25, 30 kW
Warranty: Up to 10 years, subject to terms
Explore 800 Heat
Assure Heat
A specification-led heat-only range with 16, 19 and 25 kW heating options.
Output labels: 16, 19, 25 kW
Warranty: Up to 2 years, subject to terms
Explore Assure Heat
MainEco Compact Heat
A MainEco heat-only replacement range listed in Baxi’s domestic directory.
Output labels: 15, 18, 24, 30 kW
Warranty: Up to 5 years, subject to terms
Explore MainEco Compact HeatElectric alternatives
Amptec
A slim electric flow boiler, with radiator and underfloor variants in the official manual.
Output labels: 4, 6, 9, 11, 12 kW
Warranty: Up to 2 years, subject to terms
Explore Amptec
Amptec S
An electric system boiler with six ratings and built-in heating-system components.
Output labels: 4, 6, 8, 12, 14, 18 kW
Warranty: Up to 2 years, subject to terms
Explore Amptec S
Electromax
An electric heating package with an integrated 180-litre hot-water cylinder.
Output labels: 6, 9 kW
Warranty: Component-specific: boiler 2 years; cylinder 10 years
Explore ElectromaxCompare the range around your home
This comparison explains differences without ranking appliances. Nominal labels are not interchangeable with heating ratings; the model guides show the measurement basis and any unresolved data.
| Family / arrangement | Nominal output labels | Casing dimensions | Warranty / distinction |
|---|---|---|---|
| 400 Combi 2.1 · Combi | 24, 30, 36 kW | 700 × 395 × 285 mm (H × W × D) | Up to 5 years, subject to terms |
| 600 Combi 2 · Combi | 24, 30, 36 kW | 700 × 395 × 285 mm (H × W × D) | Up to 7 years, subject to terms |
| 800 Combi 2 · Combi | 24, 30, 36 kW | 700 × 395 × 285 mm (H × W × D) | Up to 10 years, subject to terms · supplied filter required |
| Assure 500 Combi 2 · Combi | 24, 30, 36 kW | 700 × 395 × 285 mm (H × W × D) | Up to 2 years, subject to terms |
| Platinum Compact Combi · Combi | 25, 30, 36 kW | 700 × 390 × 285 mm (H × W × D) | Up to 10 years, subject to terms · supplied filter required |
| Duo-tec Compact Combi · Combi | 25, 30, 36 kW | 700 × 390 × 285 mm (H × W × D) | Up to 7 years, subject to terms |
| MainEco Compact Combi · Combi | 25, 30 kW | 700 × 390 × 285 mm (H × W × D) | Up to 5 years, subject to terms |
| 600 System 2 · System | 15, 18, 24 kW | 700 × 395 × 285 mm (H × W × D) | Up to 7 years, subject to terms |
| 800 System 2 · System | 18, 24, 30 kW | 700 × 395 × 285 mm (H × W × D) | Up to 10 years, subject to terms · supplied filter required |
| Assure 500 System 2 · System | 15, 18, 24 kW | 700 × 395 × 285 mm (H × W × D) | Up to 2 years, subject to terms |
| Megaflo Compact System · System | Not verified | Not independently verified | Up to 7 years, subject to terms |
| MainEco Compact System · System | 15, 18 kW | 700 × 390 × 285 mm (H × W × D) | Up to 5 years, subject to terms |
| 400 Heat · Heat-only / regular | 15, 18, 24, 30 kW | 625 × 370 × 270 mm (H × W × D) | Up to 5 years, subject to terms |
| 600 Heat · Heat-only / regular | 16, 19, 25 kW | 625 × 370 × 270 mm (H × W × D) | Up to 7 years, subject to terms |
| 800 Heat · Heat-only / regular | 16, 19, 25, 30 kW | 625 × 370 × 270 mm (H × W × D) | Up to 10 years, subject to terms · supplied filter required |
| Assure Heat · Heat-only / regular | 16, 19, 25 kW | 625 × 370 × 270 mm (H × W × D) | Up to 2 years, subject to terms |
| MainEco Compact Heat · Heat-only / regular | 15, 18, 24, 30 kW | 625 × 370 × 270 mm (H × W × D) | Up to 5 years, subject to terms |
| Amptec · Electric flow boiler | 4, 6, 9, 11, 12 kW | 1050 × 90 × 90 mm (H × W × D) | Up to 2 years, subject to terms |
| Amptec S · Electric system boiler | 4, 6, 8, 12, 14, 18 kW | 718 × 395 × 284 mm (H × W × D) | Up to 2 years, subject to terms |
| Electromax · Electric boiler and stored hot water | 6, 9 kW | Not independently verified | Component-specific: boiler 2 years; cylinder 10 years |
Sizing, controls and warranty
Heating output is checked against calculated heat loss. Combi hot-water output is checked against measured supply and simultaneous demand; system and heat-only choices also need an assessed cylinder. Compact dimensions do not include working clearances.
Control compatibility depends on the appliance generation, wiring and accessories. Where Baxi documents uSense or OpenTherm options, each guide identifies them. Existing smart controls are checked rather than assumed to work.
Baxi’s extended gas-boiler warranty requires registration within 30 days, a completed Benchmark checklist and annual servicing. Longer filter-dependent cover requires the specified magnetic filter to be fitted and maintained. Electric and component warranties have separate terms; your written quotation confirms eligibility.
Baxi warranty conditions · Find an initial boiler arrangementOlder Baxi appliances: assess repair before replacement
Baxi’s current support and care-kit information also covers earlier 200/400 generations, original 600/800, Duo-tec, Platinum and EcoBlue appliances. Support references do not prove that an older model is still offered for new installation. Identify the complete model, serial number and fuel before comparing parts, repair and replacement.
Official Baxi support by appliance generation · Arrange a boiler diagnosisCommon Baxi questions
Which Baxi size do I need?
SwiftHeat assesses heat loss, hot-water requirements, fuel, flue and system condition. A bedroom count or larger model number cannot select the appliance.
Can every Baxi boiler use LPG?
No. Only the configurations verified in the model tables are presented for LPG research. Conversion and commissioning requirements remain part of the installation.
Can SwiftHeat install Baxi boilers in Cardiff and South Wales?
Ask SwiftHeat for an assessed installation proposal in Cardiff, South Wales or wider UK coverage. The team confirms the scope, exact model, controls and eligible warranty before accepting the work.
Sources and manufacturer ownership
Range and specification checks: 1 October 2026. Baxi, Main and Heatrae Sadia product names and images belong to their respective owners. Images are authentic manufacturer assets, resized and compressed without reconstructing the boiler. Warranty badges are subject to the conditions explained in the guides.
Homeowner product directory · Professional product directory · Master Boilers hubInstallation and pricing
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.
SwiftHeat’s general starting package
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 conditionsHumm finance
0% 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 chargesQualifying Care+ installations
Two 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+ eligibilityOngoing support
Plan 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 adviceYour home comes first
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.
Understand suitable boiler types · Start the Boiler Finder · Our installation assessment · Areas we cover