Baxi combi boilers are a popular choice for homeowners looking for compact heating and hot water in one unit. The range spans several models, from the higher-specification 836 down to the budget-friendly Main Eco Compact, each suited to different property sizes and requirements.
If you are replacing an existing boiler or planning a new installation, comparing the Baxi 836, 830, 800 and Main Eco Compact side by side can help you decide which model best fits your home.
What Are Combi Boilers?
Combi boilers, short for combination boilers, provide central heating and hot water directly from a single unit, taking their water supply from the mains.
Unlike conventional boilers, they do not need a separate hot water cylinder or cold water storage tank, which can free up airing cupboard or loft space.
Why Choose a Baxi Combi Boiler?
Combi boilers can be a practical choice where space is limited, since the heating and hot water components are combined into one compact unit.
They also heat water on demand rather than storing it in a cylinder, which can suit homes with one bathroom particularly well. If several people need hot water at the same time, a higher-output model or a different boiler type may be more suitable.
Baxi has over 150 years of industry experience, and its current combi range is Gas Safe compliant, with several models certified to run on a 20% hydrogen blend as the gas network evolves.
Baxi Combi Boiler Models
Baxi 836 Combi Boiler
The Baxi 836 sits at the top of Baxi's current combi range. It's a strong option for medium-sized homes with up to two bathrooms, and comes with a 10-year parts and labour warranty, subject to registration with Baxi within 30 days of installation and an annual Gas Safe service.
Key features include:
- Hydrogen-ready, certified for a 20% hydrogen blend.
- SEDBUK A-rated efficiency.
- Compact, lightweight design for straightforward installation.
- Compatible with the Adey MagnaClean Micro2 filter.
Baxi 830 Combi Boiler
The Baxi 830 is a 30kW model with a 93% efficiency rating and an ERP A rating, suitable for homes with up to around 15 radiators. Like the 836, it's part of Baxi's hydrogen-ready 800 range and carries a 10-year parts and labour warranty, subject to the same registration and servicing conditions.
Key features include:
- Compatible with smart thermostats, including Baxi uSense, Hive and Nest, via OpenTherm.
- A Baxi In Flue Outdoor Sensor (IFOS) for weather compensation, satisfying Boiler Plus requirements.
- A straightforward combi-to-combi swap typically takes around 4–6 hours.
Baxi 800 Combi Boiler
The Baxi 800 range covers a lower output than the 830 and 836, with a 93% efficiency rating, an ERP A rating and support for up to around 20 radiators depending on the specific model. It also carries a 10-year parts and labour warranty, subject to registration and servicing conditions.
It's a solid choice for homeowners who want the reliability of Baxi's 800-series warranty and build quality without stepping up to the higher output of the 830 or 836.
Baxi Main Eco Compact
The Main Eco Compact sits under Baxi's Main Heating sub-brand and is positioned as a more affordable option. The 30kW model has a 93% efficiency rating and an A rating for heating and hot water, but a shorter standard 5-year warranty compared with the 800-range models.
It's compact and lightweight, compatible with LPG as well as natural gas, and works with the Baxi uSense smart thermostat — a practical choice for budget-conscious homeowners who don't need the longer warranty of the 800 range.
Choosing the Right Baxi Combi Boiler
The best Baxi combi boiler depends on more than the model name. Consider the size of your property, the number of bathrooms, your hot water demand, and whether the longer 800-range warranty is worth the difference in price over the Main Eco Compact.
If your home has multiple bathrooms or several people regularly use hot water at the same time, the higher-output 836 or 830 may be worth the extra cost. For smaller homes with lower demand, the 800 or Main Eco Compact can be more cost-effective.
You can also compare Baxi with other options in our guide to the best combi boilers in the UK.
Professional Baxi Boiler Installation
Once you have chosen a suitable model, the installation needs to be planned around your existing heating system, available space and flue requirements.
Serviceteam can assess your requirements, recommend a suitable Baxi model and carry out the installation. Need help choosing between the 836, 830, 800 or Main Eco Compact? Contact us to discuss your boiler installation.
See our boiler installation service in London if you are ready to discuss replacing your boiler.
