Boiler of the Month Baxi 800

Published: 04 Aug 2025 ・ Read time: 5 Mins

As a combi-boiler that provides homeowners with a strong, consistent flow of hot water, the 800 from Baxi is a superb boiler choice. And, designed to fit inside a standard kitchen cupboard, this is a good option for properties where space is at a premium.

A thoroughly energy efficient boiler for both heating and hot water, the Baxi 800 can help your customers keep their energy bills down. Ideal for small to medium-sized homes, the Baxi 800 wins our pick for Boiler of the Month thanks to its ability to offer a fantastic all-year-round heating and hot water solution while remaining within budget for many customers.

Here at City Plumbing, the home of heating, our popular expert boiler recommendations continue, this month highlighting the wonderful features and benefits of the Baxi 800.

About the Baxi 800 30kW Combination Boiler

The Baxi 800 Combi 2 30kW boiler is a popular choice for homeowners searching for an efficient and reliable heating and hot water solution and all with a competitive price tag.

Baxi is a solid choice for a new boiler, especially for homeowners looking for a reliable, efficient, and cost-effective option with a good warranty.

With a long history dating back over 150 years, Baxi is typically seen as a more budget-friendly option compared to premium brands, yet all without compromising on quality.

Features of the Baxi 800 Boiler

The Baxi 800 Combi 2 30kW boiler is a great option for a medium-sized house, or a flat with two to three bedrooms, and with one main bathroom and potentially an en-suite. Here we break down its key features, key specifications, and fantastic key benefits:

Key Features & Specifications

Output: The 30kW model provides a maximum domestic hot water output of 30kW, making it suitable for homes with moderate to high hot water demands, with a flow rate of up to 12.2 litres per minute. The central heating output is up to 25kW.
Dimensions: It is designed to be compact and lightweight, with dimensions of 700mm (height) x 395mm (width) x 285mm (depth), allowing it to fit neatly inside a standard kitchen cupboard.
Efficiency: This boiler is highly efficient, boasting a 93% efficiency rating and an ErP "A" rating for both heating and hot water. This is achieved through its condensing technology, which reuses heat that would otherwise be lost through the flue.
Hydrogen Ready: The boiler is certified to work with a 20% hydrogen blend, making it a future-proof option as the UK transitions towards lower-carbon fuels.
Components: It features a durable stainless steel heat exchanger and robust brass hydraulics.
Flue: The "Horizontal Flue" version comes with a flue kit for installations where the flue exits through a wall. The boiler is also compatible with a range of other flue options.
Adey Micro 2 Filter: The boiler comes complete with an Adey Micro 2 magnetic system filter included. This filter helps protect the heating system and boiler from debris and sludge, which can extend its lifespan and maintain efficiency.
Easy-Fill 2: This feature is a permanent filling link that allows homeowners to easily top up the system pressure without needing to call out an engineer, preventing unnecessary service calls.
Pre-heated Condensate Trap: This feature helps to prevent the condensate pipe from freezing in cold weather, which is a common cause of boiler breakdowns.
Controls: The boiler is compatible with Baxi's uSense smart control, which allows you to operate the heating system remotely via a smartphone or tablet. It is also certified OpenTherm, allowing it to work with other compatible smart controls for optimised efficiency.
Fuel: It can be used with both natural gas and LPG without the need for a separate conversion kit, offering flexibility.

Key Benefits of Baxi 800 Combi Boilers:

Long Warranty: The Baxi 800 Combi 2 comes with a 10-year parts and labour warranty, providing peace of mind for the homeowner.
Reduced Running Costs: Its high efficiency can lead to significant savings on energy bills and a reduced carbon footprint compared to older, less efficient boilers.
Convenience: The combination of the compact size, Easy-Fill 2 feature, and compatibility with smart controls makes the boiler convenient to install, use, and maintain.
Durability and Reliability: The use of high-quality components like brass hydraulics and a stainless steel heat exchanger, along with the included Adey Micro 2 filter, contributes to the boiler's long-term reliability.
Quiet Operation: The boiler is designed to be quiet, making it suitable for installation in living spaces like open-plan kitchens or bedrooms.

Buy Boilers at City Plumbing

With a ten year parts and labour warranty ensuring increased peace of mind for the homeowner, Baxi boilers are renowned for being easy to install, boasting a straightforward overall design, and simple to service and maintain.

Overall, the Baxi 800 30kW Combination Boiler is perfectly priced for homeowners who are on a budget but still require a highly efficient, durable heating and hot water solution.

Help your customers make the switch to a Baxi boiler today. Take a look at our City Plumbing website for more information.