The Baxi 430 Combi 2.1 is a 30kW high-efficiency condensing combi boiler engineered for medium-sized homes with up to two bathrooms. It combines instant hot water and central heating in one compact, wall-mounted unit, removing the need for a separate cylinder or tank. Built with a stainless steel heat exchanger and brass hydraulics, it runs on Natural Gas or LPG without a conversion kit, and is backed by a 5-year parts and labour warranty.
27.1kW
CH Output (Condensing)
5 Years
Parts & Labour Warranty
29kg
Installer Lift Weight
Installation must be by a Gas Safe registered engineer
This appliance must be installed, commissioned and serviced only by a Gas Safe registered engineer, in accordance with Building Regulations and the manufacturer's Installation and Service Manual. A Benchmark Commissioning Checklist must be completed on installation.
Cable sizing is site-specific
The boiler requires a permanent electrical live supply. Actual cable sizing for the fixed electrical connection must be calculated by a qualified electrician in accordance with BS 7671, based on cable run length and installation method.
Dual fuel flexibility as standard
This boiler ships ready for Natural Gas and can be manually converted to LPG without needing a separate conversion kit, making it a practical choice for both mains-gas properties and off-grid installations.
Key Features
Stainless Steel Heat Exchanger
A fully stainless steel primary heat exchanger resists corrosion and scale build-up far better than aluminium alternatives, supporting long-term reliability in hard water areas.
Pre-Heated Siphonic Condensate Trap
The condensate trap is pre-heated before discharge, significantly reducing the risk of the pipe freezing and locking the boiler out during cold winter spells.
Brass Hydraulic Block
Brass hydraulics replace lower-grade plastics at key water-carrying junctions, improving durability under the pressure cycling combi boilers experience during frequent hot water draw-off.
Combined PRV with Separate Drain
The pressure relief valve routes to its own dedicated drain point, allowing a faster and safer boiler drain-down for repairs without disturbing the main condensate route.
External Analogue Pressure Gauge
A visible external gauge lets homeowners check and top up system pressure themselves, reducing avoidable engineer call-outs for simple low-pressure faults.
Ambizen and uSense 2 Smart Control Compatible
Pairing with the Baxi Ambizen or uSense 2 Smart Room Thermostat unlocks an A+ central heating efficiency rating and remote schedule control from a smartphone app.
Technical Specification
| Performance |
| Max DHW Output |
30 kW |
| Max CH Output (Condensing) |
27.1 kW |
| Min CH Output (Condensing) |
6.3 kW |
| Max CH Output (Non-Condensing) |
25 kW |
| Max Gas Rate (Natural Gas, G20) |
3.26 m³/hr |
| Water Heating Efficiency Class |
A |
| Central Heating Efficiency (with uSense 2) |
A+ |
| SAP 2009 Efficiency |
94% |
| Hydraulic |
| Max DHW Flow Rate (ΔT 35°C) |
12.2 L/min |
| Min DHW Flow Rate Required |
2 L/min |
| Min Operating DHW Pressure |
0.5 bar |
| Integral Expansion Vessel |
7 litres |
| Max CH System Capacity |
100 litres |
| Integral Automatic Bypass |
Yes |
| Gas & Electrical |
| Fuel Type |
Natural Gas or LPG (manual conversion) |
| Inlet Supply Pressure (Natural Gas) |
20 mbar nominal |
| Permanent Live Required |
Yes |
| External Fuse Rating |
F0.5A L250VP |
| Pump Overrun |
Yes |
| Integral Frost Thermostat |
Yes |
| Dimensions & Weight |
| Height |
700 mm |
| Width |
395 mm |
| Depth |
285 mm |
| Installer Lift Weight |
29 kg |
| Minimum Side Clearance |
2.5 mm (min recommended) |
| Warranty |
| Parts & Labour |
5 Years (subject to manufacturer's T&Cs) |
Frequently Asked Questions
Is the Baxi 430 Combi 2.1 suitable for a 2-bathroom home?
Yes. With a 30kW DHW output and 12.2 L/min flow rate at 35°C rise, it is designed for medium-sized homes with up to two bathrooms and moderate simultaneous hot water demand.
Can this boiler run on LPG?
Yes. The Baxi 430 Combi 2.1 is certified for both Natural Gas and LPG and can be manually converted between the two without needing a separate conversion kit.
Does it fit in a standard kitchen cupboard?
At 700mm (H) x 395mm (W) x 285mm (D), the boiler is compact enough to fit within a 290mm deep cupboard, making it suitable for space-restricted installations.
What is the warranty on this boiler?
The Baxi 430 Combi 2.1 comes with a 5-year parts and labour warranty, subject to registration and an annual service by a Gas Safe registered engineer.
Is a smart thermostat required?
No, but pairing the boiler with the Baxi Ambizen or uSense 2 Smart Room Thermostat raises the central heating efficiency rating from A to A+ and adds remote scheduling.
