Baxi 600 Combi 2 Boiler Cost with Installation

The Baxi 600 Combi 2 is the budget-friendly boiler with a secret superpower. Underneath the cover, brass hydraulics and a stainless steel heat exchanger give the 600 Combi 2 the longevity of a more premium model but at an irresistibly lower price point. 

Whilst you don’t get the additional warranty length or added filter of its slightly more expensive brother, the Baxi 800 Combi 2, the Baxi 600 Combi 2 still has that same durable build, internal components, and flow rates – what’s not to love?

So, let’s have a closer look at some of the Baxi 600 Combi 2’s specs:

Baxi 600 Combi 2 Product Table
	Available outputs	24kW	30kW	36kW
	Type	Combi	Combi	Combi
	Fuel	Gas	Gas	Gas
	Condensing	Yes	Yes	Yes
	Efficiency rating (%)	93	93	93
	ErP	A	A	A
	LPG compatible	Yes	Yes	Yes
	Standard guarantee	7 years*
	Max output (kW)	24	30	36
	Flow rate (l/min)	10.2	12.2	15
	Mounting	Wall-mounted
	Dimensions (mm)	700 x 395 x 285
	Typical price (incl. VAT)	£1,000	£1,100	£1,300
	Typical installation cost (incl. VAT)	£800 – £1,400
	Total cost	£1,800 – £2,700

*Terms and conditions apply.

Baxi 600 Combi 2 overview

The Baxi 600 Combi 2 is a British engineered boiler without the premium price bracket. As an all-in-one combi, it delivers central heating and hot water directly from the mains. So no bulky cylinders and no loft tanks taking up valuable space. 

At 700mm high and 285mm deep, it’s one of the slimmest combis in its price bracket and is designed to tuck inside a standard kitchen cupboard. Size doesn’t stop this combi from delivering dependable performance and high efficiency, all three models are ErP A-rated, helping to keep running costs low. 

Baxi 600 Combi 2 Range
Model output size	House size	Bathrooms	Radiators
24kW	Flats, small homes 1 to 3 bedrooms	1	Up to 10
30kW	Small-medium homes 3 to 4 bedrooms	1-2	Up to 15
36kW	Medium homes 4 to 5 bedrooms	2	Up to 20

The Baxi 600 Combi 2 is a capable performer across the range, but make sure to match the kW output to your home’s specific hot water demands! With hot water flow rates ranging from 10.2 to 15 litres per minute, the Baxi 600 Combi 2 is well-suited to homes with one to two bathrooms. 

The 24kW handles single-bathroom homes comfortably, whilst the 30kW and 36kW models can manage two bathrooms – though in the morning rush, with multiple showers running simultaneously, you might notice a slight drop in pressure.

Key benefits at a glance

• ErP A-rated efficiency (93%)
• Brass hydraulics (not plastic)
• Stainless steel heat exchanger
• Ultra-compact design (285mm deep)
• Good hot water flow rates (up to 15 l/min)
• EasyFill 2 permanent filling link
• Pre-heated condensate trap (prevents freezing)
• External analogue pressure gauge
• LCD display
• Compatible with Baxi uSense smart thermostat
• OpenTherm compatible
• LPG compatible (no conversion kit required)
• Hydrogen-ready (certified for 20% blend)
• 7-year standard warranty*

Baxi 600 Combi 2 technical specifications

For those who like to know exactly what’s going on under the casing, this is where the Baxi 600 Combi 2 demonstrates that British manufacturing still has a lot to offer in the budget bracket. Baxi has made deliberate material choices, with brass hydraulics and the stainless steel heat exchanger, that set the 600 combi 2 apart from budget models using cheaper plastic and aluminium components that aren’t as hard-wearing in the long run.

Let’s take a look at the technical specs for each model in the range:

Output and efficiency ratings

All three outputs – 24kW, 30kW, and 36kW – run at 93% efficiency. This level of efficiency that the Baxi 600 Combi 2 runs at means minimal fuel wastage compared to older models – helping to curb energy bills and reducing your carbon footprint. 

Dimensions 

The Baxi 600 is compact, standing at 700 mm high, 390 mm wide, and 285 mm deep.

That 285mm depth is the real selling point as it fits comfortably into a standard 290mm kitchen cupboard with room for pipework.

Components included

The real star of the show in the Baxi 600 Combi 2 is its stainless steel heat exchanger. This is a far more durable design choice than the aluminium heat exchangers in other combi boilers, stainless steel is a material that offers significantly better resistance to corrosion and temperature stress.

The choice of brass for the hydraulics is another deliberate quality choice. Budget boilers use plastic to save money, but plastic deteriorates faster under constant temperature cycling. Baxi’s brass construction handles years of heating cycles more reliably and is much less prone to the small cracks and failures that plague plastic alternatives.

Baxi’s EasyFill 2 permanent filling link lets you top up system pressure yourself – so no need for engineer callouts when the pressure drops.

The Baxi 600 Combi 2 is well guarded against freezing, with a pre-heated condensate trap that warms condensate before it exits. If you’ve experienced an inconvenient boiler shutdown during a freeze, you’ll appreciate this.

WiFi isn’t built into the Baxi 600 Combi 2, but Baxi offers an optional Baxi uSense WiFi thermostat (£120-150) that allows for smart control compatibility. This optional add-on has real benefits when it comes to adjusting schedules when your routine changes, which can help with gas bill savings by limiting heating when it’s not needed.

With OpenTherm compatibility, this Baxi combi is compatible with popular smart thermostats such as Nest and Hive. The thermostat and boiler communicate about modulation needs, varying output rather than just switching on and off.

It’s useful to know that the 600 Combi 2 is hydrogen-ready for 20% blend, future-proofing your boiler if the UK gas grid moves to a hydrogen blend. 

This Baxi combi also allows for LPG conversion via software adjustment which saves £40-60 compared to boilers requiring physical conversion kits.

Prices and installation costs

This price range includes the boiler unit and a standard horizontal flue. The flue is a critical component that safely directs combustion gases outside your home; whilst a standard side-wall flue costs roughly £100, a vertical roof flue can exceed £500 due to the increased complexity of the installation and roofing work required.

Your final bill will be influenced by several variable factors. For those off the gas grid, this model can be converted to LPG via software adjustment by your Gas Safe engineer rather than requiring a physical conversion kit, saving you £40-£60. If you want smart control, you’ll need to budget for the Baxi uSense WiFi thermostat (approximately £120-150) as an optional extra, since WiFi isn’t built into the boiler as standard.

We’ve used a typical installation cost of £1,200 in our pricing. However, it’s important to bear in mind that installation costs can vary widely depending on your existing heating system and the complexity of work needed fitting the flue.

Baxi 600 Combi 2 Costs
Output size	Unit cost (incl. flue)	Total (incl. installation)
24kW	£1,000	£2,200
30kW	£1,100	£2,300
36kW	£1,300	£2,500

Warranty and support

7-year parts and labour warranty as standard, just register within 30 days of installation. This outperforms most budget alternatives and matches some mid-range models.

You don’t need specially trained installers or expensive filter add-ons, any Gas Safe engineer can unlock the full seven year warranty. Just register within 30 days and keep up with annual servicing.

However, seven years is the maximum and there’s no extension to 10 or 12 years like the Baxi 800 or premium brands offer. If you’re planning to stay in the property long-term, consider the Baxi 800 (10 years standard).

When a fault occurs within the warranty period, Baxi typically provides free parts and labour for manufacturing defects, with repairs carried out by its network of engineers. However, problems caused by installation errors, system sludge, or external heating system issues are not covered under the manufacturer’s warranty.

It’s important to note that the 30-day registration window is strictly enforced. If your installer forgets, your 7-year protection drops to 2 years.

Installation information

An installation for the Baxi 600 is typically around £1,200. However, this can be variable depending on the complexity of work needed. Keep in mind that every home is different, and the complexity of your current heating system may affect the final price.

What to expect on installation day

If additional work is required – such as upgrading pipework or relocating the boiler – your installer should explain this clearly beforehand, including any impact on cost or installation time.

Do you need a system flush or filter?

Under UK Building Regulations, you’ll need to install a magnetic filter to protect the boiler from sludge and debris, which typically costs £65–150 if not already included in your quote. Some installers bundle this into their overall price, whilst others list it separately, so always clarify when comparing quotes.

Whilst a system flush of existing radiators isn’t a strict requirement, it’s highly recommended. 

Over time, central heating systems accumulate “sludge” (rust) that can clog a new boiler’s heat exchanger. A flush (typically £300-£800 depending on system size and condition) cleans out this debris, and the magnetic filter then keeps it from returning, ensuring the new boiler runs at peak efficiency. Many installers bundle a system flush and filter installation into their quotes for a new boiler; doing so can also help protect your warranty, as manufacturers expect a clean system and often don’t cover boiler failure due to sludge in the warranty.

Finding a Gas Safe registered engineer

A boiler is only as good as the person who installs it. As the Baxi 600 Combi 2 is one of the UK’s most popular budget boilers, parts are widely available and most Gas Safe engineers are familiar with the installation and servicing requirements.

All installers must be Gas Safe registered by law, and because Baxi is such a well-established British brand, you shouldn’t have trouble finding qualified engineers in your area. The main consideration is ensuring your engineer actually registers the warranty within the 30-day window.

You can use the WhatPrice quote service to be matched with vetted, Gas Safe registered installers in your area who have experience with Baxi products.

Reviews and ratings

Baxi holds 4.6 out of 5 stars on Trustpilot UK, which is one of the highest scores among boiler manufacturers. 

We’ve looked at reviews for the Baxi 600 Combi 2 from Trustpilot, here’s what to expect:

Positive reviews

Multiple Gas Safe engineers praise the compact design, straightforward installation, and ease of servicing. The built-in fill lever and removable casing get regular mentions. One reviewer called it “a great little boiler” that fits standard kitchen wall units without modification.

Warranty service gets consistent praise. When faults occur, Baxi engineers typically arrive within a few days and repairs are completed efficiently, with engineers explaining the work clearly. A reviewer had a 5-year-old 600 Combi repaired under warranty within 2 days.

Long-term reliability appears solid when properly maintained. One customer reported 8 years without issues on a twice-yearly service schedule.

Negative reviews

Pressure loss crops up more often than expected. Several customers report repeated PRV (pressure relief valve) failures in the first few years, with one going through six months of intermittent drops before the engineer correctly diagnosed the failing valve. It’s frustrating when you’re topping up the system every fortnight, but this is where the EasyFill2 filling link comes in handy.

The warranty has some shortfalls; heat exchangers blocked by system debris sometimes fall outside warranty coverage, even when the boiler’s only 4 years old, leaving customers with expensive repair bills. 

Response times are a postcode lottery, with urban customers seeing engineers within 2-3 days, but rural households reporting 5-7 day waits during winter. 

A handful of reviews mention installation faults, with missing parts or incorrect setup that needed return visits. These look like installer errors rather than manufacturing problems, but they’re still three days without hot water while you wait for the fix. 

How the Baxi 600 Combi 2 compares

Baxi 600 Combi 2 Comparison Table
Model	Baxi 600 Combi 2	Worcester Bosch Greenstar 4000 Combi	Ideal Logic+ Combi
Typical unit price	£1,100	£1,200	£1,000
Heat exchanger	Stainless steel	Aluminium	Aluminium
Standard warranty	7 years	7 Years	7 Years
Max warranty	7years	10 Years	10 Years
Built-in WiFi	No	Yes	No
App control	Baxi uSense	Bosch EasyControl	Ideal Halo
Cupboard fit	Yes	Yes	Yes
Max output/bathrooms	36kW 2 bathrooms	30kW 1 & ensuite bathrooms	35kW 1-2 bathrooms

Keep in mind that this comparison focuses on key features, but there may be other details that matter more for your home. For personalised guidance on choosing the right boiler, we recommend speaking with a Gas Safe registered engineer.

Final thoughts – is the Baxi 600 Combi 2 right for you?

The Baxi 600 Combi 2 delivers solid value in the budget-to-mid bracket. You could spend £100 more for the Worcester Bosch Greenstar 4000, save £100 with the Ideal Logic+.

The material choices set this apart from true budget alternatives. Stainless steel heat exchanger and brass hydraulics are typically found on mid-range models costing £200-300 more. Budget boilers use aluminium and plastic which are adequate but less durable in the long run.

The 7-year standard warranty beats budget alternatives without needing specially trained installers. But you can’t extend it, seven years is the maximum. Want 10-year coverage? You’ll need to step up to the Baxi 800 or Worcester Bosch Greenstar 4000. 

The Worcester Bosch Greenstar 4000 30kW costs roughly £1,200 (compared to the Baxi 600’s £1,100, that’s £100 more upfront. What does that extra money buy you? Worcester’s built-in WiFi with Bosch EasyControl (no extra £120-150 thermostat purchase needed), and a 10-year maximum warranty (vs 7 years maximum with the Baxi). 

However, the Worcester uses an aluminium heat exchanger compared to the Baxi’s stainless steel. The core difference is Worcester has a wider network of installers and is known for its durability. If long-term reliability and brand reputation matter most, the Greenstar 4000 is worth the small extra. If you prefer stainless steel over aluminium and don’t mind buying the uSense thermostat separately, the Baxi 600 offers superior heat exchanger material for less money. 

The Ideal Logic+ 30kW costs roughly £1,000 compared to the Baxi 600’s £1,100, that’s £100 less upfront. On paper, they look similar: both 7-year standard warranties, both A-rated efficiency, both compact enough for standard kitchen cupboards. The difference is what’s inside. The Ideal uses an aluminium heat exchanger and plastic hydraulics. The Baxi uses stainless steel and brass. Aluminium works fine for 5-7 years, but in hard water areas aluminium heat exchangers are at risk of failure with age. The plastic hydraulics are more prone to micro-cracks under constant temperature cycling. If you’re living in a hard water area, the Baxi’s stainless steel heat exchanger and brass hydraulics are the safer long-term bet. If you want the absolute lowest upfront cost and are comfortable with aluminium components, the Ideal saves you £100.

The best combi depends on what you value most in a boiler. If a few extra years on the warranty and built in WiFi sound best, then opt for the Worcester Bosch Greenstar 4000. If internal build materials matter more to you – then Baxi is a clear winner.  

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