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Baxi combi boilers are popular in the UK because the range includes compact models for smaller homes, higher-specification options with longer warranties and features designed to simplify everyday operation.

But the best Baxi combi boiler is not automatically the biggest or most expensive model. The right choice depends on the property’s heat loss, hot-water demand, incoming mains-water flow, available installation space, controls and budget.

In this Baxi combi boilers review, we compare the main Baxi ranges, explain the warranty conditions, identify the strongest advantages and limitations, and outline what to check before requesting an installation quote.

Quick verdict: Baxi is worth considering when you want a well-established boiler range with compact options and clear model differences. Compare the Baxi 400, 600 and 800 ranges by warranty, features, hot-water performance and total installed price rather than brand name alone.

Not sure if Baxi is the right choice for your home? Compare it against other leading brands in our comprehensive guide to the Best Combi Boilers 2026, or request a boiler installation quote based on your property today

Are Baxi combi boilers good?

Baxi combi boilers can be a sensible option for many homes, particularly where a compact boiler is needed and the property has moderate hot-water demand.

The range has different warranty levels and features. The Baxi 600 Combi 2, for example, is listed by Baxi with a seven-year parts and labour warranty. The Baxi 800 Combi 2 is listed with a 10-year parts and labour warranty, but the longer warranty has specific conditions, including registration, an annual service, completion of the Benchmark checklist and the required magnetic filter being fitted and maintained.

That means a model should not be judged only by its headline warranty. The installation quality, system condition, annual servicing and the manufacturer’s warranty conditions are equally important.

Baxi combi boiler range at a glance

Baxi range	What the official information currently shows	May suit
Baxi 400 Combi 2.1	Compact range with a five-year parts and labour warranty	Homeowners prioritising a lower-specification compact option, subject to model suitability
Baxi 600 Combi 2	Compact boiler with a seven-year parts and labour warranty, EasyFill and uSense compatibility	Smaller or medium-sized homes with suitable mains flow and moderate hot-water demand
Baxi 800 Combi 2	Ten-year parts and labour warranty, Adey Micro 2 filter included and uSense compatibility	Homeowners seeking additional features and a longer conditional warranty

Warranty lengths and terms can change. Check the exact model and current manufacturer conditions before relying on the table.

Official Baxi Specifications and Warranty Information

For the most up-to-date product details, homeowners should check the official Baxi 600 Combi 2 product page and Baxi 800 Combi 2 product page before choosing a model. Baxi currently lists a seven-year parts and labour warranty for the 600 range and a 10-year parts and labour warranty for the 800 range, but these warranties are subject to conditions. The boiler must be registered within the required period, the Benchmark checklist must be completed, and annual servicing must be carried out. For the Baxi 800 range, the required magnetic filter must also be fitted and maintained. Read the complete Baxi boiler warranty information and confirm the terms for the exact model before installation.

Considering a Baxi combi boiler for your home? Request a new boiler quote from Let’s Heat based on your property, hot-water demand and installation requirements

Baxi 600 Combi 2 review

The Baxi 600 Combi 2 is positioned as a compact, simple-to-use combi boiler. Baxi lists a seven-year parts and labour warranty for the model, subject to the applicable terms.

Main Baxi 600 Combi 2 features

The manufacturer currently lists features including:

•EasyFill for topping up central-heating pressure;

•compatibility with the Baxi uSense smart thermostat;

•operation with natural gas or LPG without a conversion kit;

•a pre-heated condensate trap intended to reduce the risk of freezing; and

•an external analogue pressure gauge.

Baxi lists the dimensions as approximately 395mm wide, 700mm high and 285mm deep, with the required clearances and service access still needing to be checked at the proposed installation location.

Who may suit the Baxi 600?

The Baxi 600 can be worth considering for a smaller or medium-sized property where:

•there is one main bathroom or moderate hot-water demand;

•the incoming mains-water flow is suitable;

•a compact boiler is useful;

•the proposed position allows compliant flue and condensate routes; and

•the seven-year warranty meets the homeowner’s expectations.

The boiler should not be selected from property size alone. Hot-water flow, simultaneous use, heat loss and the existing heating system still need to be assessed.

Baxi 600 limitations to consider

The Baxi 600 may not be the best choice simply because it is compact. Consider:

•whether the incoming mains supply can support the expected hot-water demand;

•whether the model’s hot-water output suits the number of bathrooms;

•whether the available warranty is sufficient for your plans;

•whether smart controls are included or an additional cost; and

•whether the existing system needs cleaning, upgrades or pipework changes.

Baxi 800 Combi 2 review

The Baxi 800 Combi 2 is the higher-specified option in the current comparison. Baxi lists a 10-year parts and labour warranty, compatibility with the uSense smart control, EasyFill, a pre-heated condensate trap and an Adey Micro 2 magnetic filter included with the boiler.

Main Baxi 800 Combi 2 features

The official product information currently lists:

•a 10-year parts and labour warranty, subject to conditions;

•an Adey Micro 2 filter included with the boiler;

•EasyFill for topping up system pressure;

•uSense smart-control compatibility;

•a pre-heated condensate trap;

•natural gas or LPG compatibility without a conversion kit; and

•an external analogue pressure gauge.

Baxi lists dimensions of approximately 395mm wide, 700mm high and 285mm deep. Installation clearances and servicing access must be checked at the property rather than assumed from the dimensions alone.

Who may suit the Baxi 800?

The Baxi 800 may be worth comparing when:

•the homeowner values a longer conditional warranty;

•the included magnetic filter fits the installation specification;

•smart-control compatibility is useful;

•the property has suitable mains flow and moderate-to-high combi demand; and

•the total installed price remains competitive against alternatives.

The 800 is not automatically the right choice for a large property. If several showers or taps are used simultaneously, a system boiler and cylinder may provide a more suitable hot-water arrangement.

Baxi 800 warranty conditions

The 10-year warranty should not be described as unconditional. Baxi states that the warranty depends on requirements including:

•registering the boiler within 30 days of installation;

•completing the Benchmark checklist;

•carrying out an annual service; and

•fitting and maintaining the required magnetic filter for the relevant warranty period.

Baxi also states that if the warranty is not registered, the Benchmark checklist is not completed or annual servicing is not carried out, the warranty can revert to the standard one-year period. The exact terms should be checked for the model and installation.

Baxi 400, 600 or 800: which should you choose?

The best model depends on the installation rather than the range number.

Choose the Baxi 400 for a simpler budget comparison

The Baxi 400 range may be worth comparing when the installation is straightforward and the homeowner prioritises a compact option and lower specification. The official Baxi warranty information lists a five-year parts and labour warranty for the 400 range, subject to the applicable conditions.

Check the model’s output, hot-water flow, warranty terms and installed price before treating it as the cheapest long-term option.

Choose the Baxi 600 when compact size and a mid-range warranty matter

The Baxi 600 may suit homeowners who want a compact model with EasyFill, smart-control compatibility and a seven-year parts and labour warranty. It is most likely to suit properties with suitable mains flow and moderate hot-water demand.

Choose the Baxi 800 when the additional features justify the price

The Baxi 800 may be worth comparing when the 10-year conditional warranty, included filter and higher specification provide enough value to justify the complete installed price.

Do not compare only the boiler prices. Compare the boiler, controls, filter, system cleaning, flue, removal, commissioning, warranty registration and any required pipework together.

Baxi combi boiler pros and cons

Potential advantages	Potential limitations
Compact models are available	A combi relies on the incoming mains supply for hot water
The 600 and 800 ranges have different warranty levels	Warranty conditions must be followed carefully
EasyFill can make pressure top-ups simpler	EasyFill does not diagnose the reason for repeated pressure loss
uSense smart-control compatibility is available on relevant models	Smart controls may not be included in every installation package
The 800 includes an Adey Micro 2 filter according to Baxi’s product information	The filter must be fitted and maintained for the relevant 10-year warranty condition
Some models work with natural gas or LPG	Exact model suitability depends on the property and fuel arrangement
Compact dimensions may help with cupboard planning	Service clearances and flue requirements still apply

How much do Baxi combi boilers cost?

There is no reliable single Baxi combi boiler price because the total cost includes more than the appliance.

The final installed quotation can depend on:

•Baxi model and output;

•boiler position;

•flue and terminal arrangement;

•gas supply and pipework;

•condensate drainage;

•heating-system condition;

•controls and smart thermostat;

•magnetic filter;

•system cleaning and inhibitor;

•removal and disposal of the old boiler;

•cylinder or tank changes; and

•access and making-good work.

A like-for-like combi replacement in the same suitable position is normally less involved than converting from a regular boiler, replacing a back boiler or relocating the appliance.

For current Let’s Heat package information and broader installation factors, see the new boiler cost guide and boiler replacement cost guide.

Baxi boiler prices vary depending on the exact model, installation package, VAT treatment and scope of work. Request a personalised quotation that clearly lists these elements.

What should a Baxi boiler installation quote include?

When comparing Baxi installers, ask for a written quotation showing:

•exact Baxi model and output;

•boiler position;

•flue and additional components;

•heating controls;

•smart thermostat, if selected;

•magnetic filter;

•chemical cleaning or power-flush requirements;

•corrosion inhibitor;

•gas and heating pipework changes;

•condensate drainage;

•removal and disposal of the old boiler;

•commissioning;

•Benchmark checklist completion;

•warranty registration;

•Building Regulations notification or certification where applicable;

•VAT treatment; and

•exclusions, provisional work and making-good.

A lower headline price may exclude controls, filter installation, system cleaning or extra flue components. Compare the scope line by line.

Is a Baxi combi suitable for your home?

A Baxi combi may be suitable when the household has moderate simultaneous hot-water demand and the incoming mains supply can provide the required flow.

Before choosing one, the installer should consider:

•property heat loss;

•number of bathrooms;

•simultaneous shower and tap use;

•mains-water flow and pressure;

•desired hot-water flow rate;

•available installation space;

•flue and condensate routes;

•gas supply;

•heating controls; and

•service access.

If the property regularly uses multiple hot-water outlets at once, compare a system boiler with a cylinder. A larger combi cannot create more water than the incoming main can deliver.

For more guidance, read combi boilers and different types of boiler systems.

Baxi combi boiler installation and warranty requirements

A Baxi boiler should be installed and commissioned by a suitably qualified Gas Safe registered engineer. The installation should follow the manufacturer’s instructions and applicable Building Regulations.

For the warranty, keep the installation and service records. Check that:

•the boiler is registered within the required period;

•the Benchmark checklist is completed;

•annual servicing is arranged;

•the magnetic filter is fitted and maintained where required; and

•the warranty conditions for the exact model are understood.

A manufacturer’s warranty does not replace good installation, correct system design or annual maintenance.

Baxi combi boilers and smart controls

Relevant Baxi combi models are compatible with the Baxi uSense smart thermostat. Smart controls can help with schedules and remote adjustments, but the control package should be identified in the quotation.

Check whether the price includes:

•the thermostat;

•receiver or wiring components;

•installation;

•app setup;

•connection to the home network; and

•demonstration of the controls.

Do not assume that compatibility means the smart thermostat is included in every boiler package.

How long does Baxi combi boiler installation take?

The time depends on the existing system and the work required.

A straightforward combi-for-combi replacement may be completed more quickly than a regular-boiler-to-combi conversion. Conversions can involve cylinder and tank removal, pipework changes, controls, system cleaning and additional commissioning.

Boiler relocation, difficult access, new flue work and making good can extend the installation. Read our guide to how long boiler installation takes.

Baxi combi boiler servicing and repairs

Annual servicing helps check the boiler’s condition, safety and warranty requirements. Let’s Heat’s verified service information states that a boiler service takes approximately 40–60 minutes and starts from £75 when no replacement parts are required.

The final service price depends on the boiler type and age and whether parts are needed. The £75 starting price is not a fixed price for every boiler or visit and does not automatically include parts. See the boiler service page.

If a Baxi boiler develops a fault, Let’s Heat repair starts from £120 excluding VAT, including the first hour of labour. The fault type, component and parts required can change the final price. The starting price is not a fixed full-repair price or a guaranteed emergency call-out fee. See Baxi boiler repair or the general boiler repairs service.

Baxi combi boiler review: our verdict

Baxi offers a credible range of combi boilers with different price and warranty positions.

The Baxi 600 Combi 2 is worth comparing when compact size, EasyFill and a seven-year warranty are important. The Baxi 800 Combi 2 is worth comparing when the included filter, smart-control compatibility and longer conditional warranty justify the additional installed cost. The Baxi 400 range may be considered where a simpler lower-specification option is suitable.

However, the brand or warranty length should not decide the installation by itself. The mains-water supply, hot-water demand, heat loss, flue, controls, system condition and installer quality matter just as much.

The best next step is a property-specific quotation that shows the exact Baxi model, installation scope and warranty requirements.

Baxi combi boiler installation in local areas

Let’s Heat boiler installation and replacement are available across its service areas, subject to complete postcode confirmation, survey and availability.

For local service information, use the page relevant to the property:

•Boiler installation in Cardiff

•Boiler installation in Newport

•Boiler installation in Bristol

•Boiler installation in Barry

Frequently asked questions

Are Baxi combi boilers any good?

Baxi combi boilers can be a suitable option when the model matches the property’s heating and hot-water requirements. Compare the exact model, output, warranty conditions, mains-water suitability, installation scope and total price rather than relying on the brand alone.

Which Baxi combi boiler is best?

There is no single best model for every home. The Baxi 600 may suit a compact mid-range installation, while the Baxi 800 may suit a homeowner who values its additional features and longer conditional warranty. The Baxi 400 may suit a simpler specification where the exact model meets the property’s needs.

Does the Baxi 800 have a 10-year warranty?

Baxi currently lists a 10-year parts and labour warranty for the 800 range, subject to conditions including registration within 30 days, completion of the Benchmark checklist, annual servicing and fitting and maintaining the required magnetic filter. Check the current terms for the exact model.

Does the Baxi 600 have a seven-year warranty?

Baxi currently lists a seven-year parts and labour warranty for the 600 range, subject to the manufacturer’s applicable conditions. Confirm the exact terms at the time of purchase and installation.

Is a Baxi 600 suitable for a small house?

It may be suitable where the mains-water supply, heat loss, hot-water demand and proposed installation position are appropriate. A property assessment is still required.

Can a Baxi combi work with LPG?

Baxi lists selected models, including the 600 and 800 Combi 2, as working with natural gas or LPG without a conversion kit. Confirm the exact model, fuel supply and installation requirements before ordering.

Does Baxi include a magnetic filter?

Baxi’s official product information lists an Adey Micro 2 filter included with the 800 Combi 2. Do not assume the same inclusion applies to every range or package. Check the exact model and quotation.

Are Baxi combi boilers suitable for two bathrooms?

They can be, but suitability depends on simultaneous use and mains-water flow. If several showers and taps operate together, compare stored hot water through a system boiler or another suitable arrangement.

How much does a Baxi combi boiler installation cost?

There is no single price. The final installed cost depends on the Baxi model, boiler position, flue, gas and heating pipework, controls, system cleaning, removal and any cylinder or tank changes. Request a property-specific quotation.

How often should a Baxi combi boiler be serviced?

Follow the manufacturer’s warranty and servicing requirements. Baxi states that annual servicing is required to keep the listed warranty conditions valid. Let’s Heat’s service information states approximately 40–60 minutes and from £75 when no replacement parts are required.

What if my Baxi boiler needs a repair?

Arrange a diagnosis rather than replacing the boiler based on a fault code alone. Let’s Heat repairs start from £120 excluding VAT, including the first hour of labour; parts and additional work may change the final cost.

Get a Baxi combi boiler quote

Before choosing a Baxi model, ask for a quotation based on the actual property. The installer should assess the heating load, hot-water demand, mains-water performance, boiler position, flue, condensate, gas supply, controls and system condition.

Request a new boiler quote from Let’s Heat and ask for the exact Baxi model, warranty conditions and complete installation scope in writing.

You can also visit the Let’s Heat homepage.

Mo Alwadi (Gas Safe Registered Engineer)

Mo Alwadi is Renewable Manager at Let’s Heat and a Gas Safe registered engineer (registration no. 977042), with experience in domestic heating and air conditioning. He contributes technical guidance on boiler installation, boiler replacement, heating systems, air conditioning and home energy solutions, helping UK homeowners understand their options and make informed decisions.

View all posts by Mo Alwadi →

Baxi Combi Boilers Review 2026: Models, Warranty, Prices and Pros and Cons

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