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Baxi Duo-tec GA Boilers


Baxi Duo-tec GA Boilers have been manufactured in the UK to suit all size properties with four different output flow rates: 24kW, 28kW, 33kW, and 40kW, along with taking the best technology which sold the Baxi Duo-tec Combi so well.

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The boilers can be wall hung or will fit in a standard kitchen cupboard – Height 763mm, Width 450mm, Depth 345mm.

This boiler range is A-rated by SEDBUK and recognised by the Energy Saving Trust for the energy efficiency, which is maximised from the combustion management system, THINK.

The boiler efficiency rating is 91%, making it environmentally friendly and to help save money on the energy bills. The heating system monitors the air max and gas, which is burning, so it operates as efficiently as possible.

This well designed Baxi range is excellent value for money, prices not including installation fees start at £680 for the smaller kW up to around £1020 for the 40kW.

The 24kW would be great for a flat or apartment, not needing too much hot water as the hot water is available at 9.8 litres per minute. The 40kW which would be perfect for a 3 to 5 bedroom home that demands a lot of hot water, is available at 16.4 litres per minute.

The warranty is seven years for parts and labour as standard.

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Warranty is excellent for peace of mind in case any issues occur. Always follow guidelines to keep the warranty valid. 

If you would prefer having installation fees included along with having your warranty registered without you having to do anything, go to


The Baxi boiler comes with user-friendly controls and is simple to install and service for the Gas Safe registered engineer. The fuel efficiency rating is 1:7, which ensures reliability, efficiency, and smooth running.

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Gas Adaptive Control feature is included, meaning it recycles the heat from the flue gases, which would usually go to waste. The system’s performance should reach full life expectancy, lower fuel costs, and maximum efficiency.

Alongside the above to help speed up installation include is a built-in frost thermostat, pre-plumbing parts,pre-formed copper pipes, and a built-in filling loop.

Different flue kits are available so you can place the boiler in your desired location.

uSense smart control enables you to connect your boiler to your smartphone or tablet so you can manage your heating wherever you are; this will save wastage and save money.

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You can also fit this boiler with a Time and Temperature control.


Baxi Duo-tec GA Boilers Models & Costs

Duo-tec Combi 24 GA Combi H – 763 mm
W – 450 mm
D – 345 mm
9.8 l/min 24 kW 90% AND ABOVE £752.66
Duo-tec Combi 28 GA Combi H – 763 mm
W – 450 mm
D – 345 mm
11.5 l/min 28 kW 90% AND ABOVE £874.37
Duo-Tec Combi 33 GA Combi H – 763 mm
W – 450 mm
D – 345 mm
13.5 l/min 33 kW 90% AND ABOVE £964.37
Duo-Tec Combi 40 GA Combi H – 763 mm
W – 450 mm
D – 345 mm
16.4 l/min 40 kW 90% AND ABOVE £1014.36


User friendly controls Easy to use
SEDBUK A Rating Lower gas bills
Modulation ration 1:7 Fewer ignitions required, greater reliability
Various Kw Heating Output – 24kW, 28kW, 33kW & 40kW For different sized homes
NOx emissions are ultra low The best
Frost Protection Safety
Modulation Ratio Of 1 : 7 – Resulting in high reliability and smoother running Fuel efficient
Cuts Energy Bills Fuel efficient
Gas Adaptive Controls – Deliver Optimum Combustion Levels Ease of use
2 speed pump Equals a 40% reduction in electrical consumption per year
Multi fit GasSaver Recycles the heat from the flue gases which would normally be wasted
Two year warranty Peace of Mind



Conclusion on the Baxi Duo-tec GA:

Our thoughts on this updated, compact, lighter gas boiler than the Baxi Duo-tec Combi. Great that this system is easy to locate for homes with less space and powerful enough to run larger homes with different output flow rates.

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It is brilliant that it can be fitted to the latest updated technology such as uSense, as well as it is known to be quick at heating radiators. Nobody wants to come home to a cold home but doesn’t want to waste energy and money either. With uSense, and this Baxi boiler range, both those problems are solved.

The seven-year warranty is also good to know. Not the longest on the market but not the shortest either.

Overall this is a well-rated Baxi combi boiler.

Baxi Duo-tec GA Boilers Compare Boiler Quotes


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What our customers think

5 Stars on Trustpilot

Would recommend

Stressed when needed a new boiler but easy process with affordable finance. New boiler installed within a few days with option for next day.

Paul Jones 5 Star on Trustpilot

We were very impressed

On the day, they came on time. Lovely people, they kept everything clean. Explained everything to me. No mess, kept me informed.

Anne Cross 5 Star on Trustpilot

Great Experience

Great experience - quick to arrange, easy to work with the very responsive online team and all installed faster than expected.

Ms Baxter 5 Star on Trustpilot

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