Combi Boilers

Baxi 400 Combi 2.1

The Baxi 400 Combi 2.1 has a 5-year parts and labour warranty† is lightweight, contains brass hydraulics and a stainless steel heat exchanger.

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Features and Benefits
Product Literature
Dimensions
Technical Specification

Features and Benefits

Multiple outputs

Available in outputs of 24, 30 and 36kW, natural gas or LPG manual conversion

Safer and cleaner

Combined PrV with separate drain to facilitate a safer and quicker boiler drain down for repair

Robust components

Brass hydraulics and stainless steel heat exchanger for peace of mind

Ready for winter

Pre-heated condensate trap to help prevent freezing in winter - less risk of frozen condensate pipes!

Quicker installation

Compatible with Baxi Easy-Flue for a safer and quicker one-person fit installation from inside the property

Pressure gauge

External analogue pressure gauge for easy self-top up, to help prevent call outs

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Product Literature

Installation & Service Manuals

User Guides

Technical Specifications

Product Fiche

Energy Labels

Dimensions

A: Boiler width = 395mm

B: Boiler height = 700mm

C: Boiler depth = 285mm

D: Side clearance = 2.5mm

E: Upper clearance = 178mm

F: Lower clearance = 150mm

G: Front clearance = 5mm in operation (450mm for servicing)

Technical Specification

Product Model	424 Combi 2.1	430 Combi 2.1	436 Combi 2.1
Product Code	7872835	7872836	7872837
Gas
Natural gas or LPG	Yes	Yes	Yes
Inlet supply pressure (natural gas) (mbar (nominal))	20	20	20
Maximum Gas Rate (G20) Qmax (m³ / hr)	2.61	3.26	3.9
Heat Input CH (kW (max) Gross (QnHs))	20.6	25.7	25.7
Heat Input CH (kW (min) Gross (QnHs))	4.9	6.0	7.2
Heat Output CH (non-condensing) (kW (Max) (Pn))	20	25	25
Heat Output CH (non-condensing) (kW (Min) (Pn))	4.8	5.8	7.2
Heat Output CH (condensing) (kW (Max) (Pnc))	21.8	27.1	27.1
Heat Output CH (condensing) (kW (Min) (Pnc))	5.2	6.3	7.6
Heat Input domestic hot water (DHW) (kW max gross (QnwHs))	27.4	30.9	36.9
Heat output domestic hot water (DHW) (kW max)	24	30	36
Water heating efficiency class	A	A	A
Electrical
Permanent live required	Yes	Yes	Yes
External fuse rating (on connection board) (Amps)	F0.5A L250VP	F0.5A L250VP	F0.5A L250VP
Pump overrun	Yes	Yes	Yes
Integral 'boiler only' frost thermostat	Yes	Yes	Yes
Hydraulic
Maximum DHW flow rate (Delta T @ 35'C rise) (l/min)	10.2	12.2	15.0
Minimum DHW flow rate required (l/min)	2	2	2
Minimum operating DHW pressure required (bar)	0.5	0.5	0.5
Integral expansion vessel (Size (litres))	7	7	7
Maximum capacity of the CH system (Litres)	100	100	100
Integral automatic bypass	Yes	Yes	Yes
Weights
Installer Lift Weight (kg)	28	29	30

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Baxi Care Kits

Baxi Care Kits are preventive maintenance kits designed to help maintain boiler efficiency, performance and reliability over time - helping reduce disruption for homeowners and supporting a proactive approach to maintenance.

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Baxi Genuine Parts

Whether you are working on an installation, repair or service, Baxi Genuine Parts are guaranteed for quality, reliability and safety. Start here to find the parts you need.

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Product Training

Our training courses are held in our state-of-the-art training centres, several with CIPHE approval, by experienced, qualified engineers who know what the job is like.

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Error Codes for Baxi Boilers

If a boiler develops a problem, it will display an error code. We explain the most common error codes here.

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Baxi Works

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† Terms and conditions apply.