Ideal Logic Max System Boiler Cost with Installation

The Ideal Logic Max is one of the most consistently recommended system boilers in the UK market – and one that gets far less attention than it deserves. Made in Britain, available in four outputs from 15kW to 30kW, 93% efficient, with a 10-year standard warranty and the Ideal System Filter already in the box.

The latest generation is the Logic² Max, which adds a high-resolution colour screen and a sleek modern casing to the well-established Logic Max platform. At this price, it undercuts the Worcester Bosch Greenstar 4000 System and the Baxi 800 System while matching both on warranty length.

Discover more of the Ideal Logic Max system boiler specifications below:

Ideal Logic Max System Boiler Product Table
	Model	15kW	18kW	24kW	30kW
	Type	System	System	System	System
	Fuel	Gas	Gas	Gas	Gas
	Condensing	Yes	Yes	Yes	Yes
	Efficiency rating (%)	93	93	93	93
	ErP	A	A	A	A
	LPG compatible	No	No	No	No
	Standard guarantee	10 years
	Max output (kW)	15	18	24	30
	Min output (kW)	4.8	4.8	4.8	4.8
	DHW flow rate	Determined by cylinder
	Mounting	Wall-mounted
	Dimensions (mm)	700 x 395 x 278
	Filter included	Ideal System Filter
	Typical price (incl. flue)	£1,000	£1,050	£1,150	£1,300
	Typical installation cost (incl. VAT)	£1,500
	Total cost	£2,500	£2,550	£2,650	£2,800

*Terms and conditions apply.

Ideal Logic Max System Boiler overview

A system boiler heats water and stores it in a separate hot water cylinder, so multiple bathrooms can draw simultaneously without the flow rate ceiling of a combi. The Logic Max does this efficiently across four outputs – the widest output range of any system boiler in this price bracket – and does it quietly enough that one owner with a Logic Max System 30 fitted in a five-bedroom house says they often wonder if it’s on at all.

The Logic² Max is the current generation, updated with a high-resolution colour screen and a fresh casing design. The engineering underneath – 93% efficiency, 10-year warranty, Ideal System Filter included, minimum modulation of 4.8kW – is the Logic Max platform that’s been refined over years of UK field experience. The 278mm depth makes it one of the shallower system boilers on the market, fitting a 290mm cupboard with clearance to spare.

Ideal Logic Max System Boiler Range
Model	Suitable for	Radiators	Notes
15kW	Small homes, 1-2 bedrooms	Up to 10	Best for smaller properties with an existing cylinder
18kW	Small to medium homes, 2-3 bedrooms	Up to 12	Good for single bathroom homes with a cylinder
24kW	Medium homes, 3 bedrooms	Up to 15	Standard family home choice
30kW	Large homes, 3-4 bedrooms	Up to 20	For properties with higher heat demand

Output selection is based on your property’s heat loss, not the number of bathrooms – the cylinder handles hot water capacity separately. Your Gas Safe engineer calculates the correct output from a heat loss assessment at survey stage. For most three-bedroom homes, the 24kW is the right starting point.

Key benefits at a glance

• ErP A-rated efficiency (93% efficient)
• British made
• Four outputs from 15kW to 30kW – widest range at this price point
• 10-year parts and labour warranty as standard
• Ideal System Filter included in the box
• 278mm depth – one of the shallower system boilers available
• Scratch-resistant casing
• High-resolution colour screen (Logic² Max)
• Minimum modulation of 4.8kW for efficient low-demand operation
• Front-panel pressure gauge
• Compatible with Ideal Halo smart thermostat, Nest, and Google Home
• Hydrogen blend ready (up to 20%)

Ideal Logic Max System Boiler technical specifications

The Logic Max’s value proposition is clearer when you look at what the 10-year warranty actually covers and what’s already in the box. The Ideal System Filter is included, not sold separately – on a system that typically costs £80-£150 to add, that’s a genuine saving against rivals at a similar price. The 278mm depth is the shallowest measurement in this comparison set. And the 4.8kW minimum modulation output means the boiler can genuinely whisper along on mild days rather than firing and cutting at a fraction of its output.

Output and efficiency ratings

All four models run at 93% ErP A-rated efficiency – a condensing boiler that recovers heat from exhaust gases that older non-condensing boilers vented outside. As with any condensing system, homeowners replacing a pre-2005 installation often see a meaningful reduction in gas bills within the first heating season.

The 4.8kW minimum modulation is the standout technical figure. Most system boilers at this price modulate to somewhere between 6kW and 8kW – the Logic Max’s 4.8kW minimum means it can hold temperature more steadily in well-insulated homes or during milder weather without cycling on and off unnecessarily. Less cycling means less component wear and more consistent room temperatures. Paired with an OpenTherm thermostat like the Ideal Halo, the modulation becomes load-responsive, adjusting continuously to actual demand.

Dimensions

700mm tall, 395mm wide, and 278mm deep. That 278mm depth is the Logic Max’s most practically useful physical specification – it is 7mm shallower than the Baxi 600 and 800 System (285mm), 32mm shallower than the Worcester Bosch 4000 System (310mm), and fits a standard 290mm deep kitchen cupboard comfortably.

The scratch-resistant casing is a minor detail that matters in high-traffic utility installations where cupboard doors are opened and closed daily.

What’s under the casing

The Ideal System Filter is the first thing worth noting – it’s included in the box and must be fitted and registered at installation to maintain the 10-year warranty. At a retail value of £80-£150, its inclusion puts the Logic Max ahead of the Baxi 600 System 2 (which requires a separate filter purchase) and on a par with the Baxi 800 System (which also includes the Adey Micro2).

The Logic² Max adds a high-resolution colour screen that displays system status, temperatures, and fault codes in plain text. Front-access servicing and a front-panel pressure gauge make routine maintenance and self-top-up straightforward without opening panels or consulting a manual.

Smart control is available via the Ideal Halo thermostat range, which works with the Logic Max via OpenTherm for responsive, load-compensated control. The boiler is also compatible with Nest and Google Home for homeowners who prefer third-party ecosystems.

Prices and installation costs

The Ideal Logic Max System costs approximately £1,000 for the 15kW, £1,050 for the 18kW, £1,150 for the 24kW, and £1,300 for the 30kW – all including a standard horizontal side-wall flue and the Ideal System Filter. If a vertical roof flue is required, budget an additional £300-£500.

Using a mid-range installation figure of £1,500:

Ideal Logic Max System Boiler Costs
Output size	Unit cost (incl. flue + filter)	Total (incl. installation)
15kW	£1,000	£2,500
18kW	£1,050	£2,550
24kW	£1,150	£2,650
30kW	£1,300	£2,800

These prices assume a like-for-like system boiler replacement with an existing cylinder in place. A new unvented cylinder adds £500-£1,000 plus fitting. Converting from a combi with no existing cylinder can add up to £2,000 to the total project cost.

These prices are indicative, based on our research and actual boiler prices submitted to WhatPrice by homeowners. For a full overview of Ideal pricing, see our Ideal boiler prices guide. Get quotes from at least three Gas Safe registered installers, or use the WhatPrice Boiler Cost Calculator for a guide price.

Warranty and support

Ten years, parts and labour, as standard. Register within 30 days of installation, fit the included Ideal System Filter, and service annually by a Gas Safe engineer – those are the three conditions. No premium installer tier, no accreditation requirement, no additional payments. For a 10-year warranty, that’s about as clean as it gets.

Ideal’s customer service draws mixed feedback – strong on the product itself, less consistent on response times for warranty call-outs. The reviews below are honest about this.

Installation information

A like-for-like system boiler replacement on existing pipework is a one-day job. At 278mm deep and a competitive weight, the Logic Max is one of the easier system boilers to manoeuvre into a tight cupboard installation. If you’re fitting a new cylinder alongside, expect one to two days and confirm your installer holds a G3 unvented hot water qualification in addition to Gas Safe registration.

What to expect on installation day

Do you need a system flush or filter?

The Ideal System Filter is included in the box – fitting it simultaneously satisfies the UK Building Regulations requirement for a magnetic filter and activates the 10-year warranty. No separate purchase needed.

A powerflush of existing pipework isn’t legally required but is strongly recommended on systems over ten years old. Connecting a new boiler to a system full of sludge undermines performance from day one. Budget £350-£800 depending on the number of radiators.

Finding a Gas Safe registered engineer

All gas boiler installations must be carried out by a Gas Safe registered engineer. For a new unvented cylinder, a G3 qualification is additionally required. Use the WhatPrice quote service to be matched with vetted, Gas Safe registered installers in your area.

Reviews and ratings

Ideal holds a 4.8 out of 5 rating on Trustpilot UK. The Logic Max System generates clear model-specific feedback – and the two accounts below represent both ends of the experience honestly.

Positive reviews

One owner with a Logic Max System 30 fitted in a five-bedroom, three-bathroom house describes the boiler as the best they’ve ever owned – a strong statement for a system serving that size of property. Quiet operation is the headline: they report often wondering if it’s on at all. The Google Nest integration is described as seamless, the 10-year warranty and 93% efficiency are cited as decisive factors at purchase, and the whole package is enthusiastically recommended. This review is consistent with the broader positive feedback in the Logic Max pool, where quiet operation and the value-to-specification ratio are the recurring themes.

Negative reviews

The most detailed critical account involves a brand new Logic Max S24 that developed a fault two hours after installation. The warranty call-out took four days to arrive – despite a vulnerable person in the household being flagged. The engineer replaced a part, but the fault returned within an hour. Getting the engineer sent back required six hours of calls and escalation to management, who declined to expedite the return visit. The second appointment was scheduled two days later.

This is a specific account of a worst-case scenario: a faulty unit, slow initial response, an unsuccessful first repair, and an inflexible customer service team. Ideal’s 4.8 Trustpilot score reflects that this isn’t the typical experience – but for a brand new boiler that fails on day one, the response described falls significantly short of what a 10-year warranty implies in practice. If you’re in a household with a vulnerable person, it’s worth asking your installer what Ideal’s priority call-out process is before installation day.

How the Ideal Logic Max System Boiler compares

Ideal Logic Max System Boiler Comparison Table
Model	Ideal Logic Max System	Baxi 800 System	Worcester Bosch Greenstar 4000 System
Typical unit price (24kW)	£1,150	£1,150	£1,200
Heat exchanger	Aluminium	Stainless steel	Aluminium
Standard warranty	10 years	10 years	5 years
Max warranty	10 years	10 years	10 years
Filter included	Yes (Ideal System Filter)	Yes (Adey Micro2)	No
Built-in WiFi	No	No	Yes
App control	Ideal Halo (optional)	uSense 2 (optional)	EasyControl (built-in)
Depth (mm)	278	285	310
Max output	30kW	24kW	24kW
LPG compatible	No	Yes	Yes

For personalised guidance on choosing the right boiler, we recommend speaking with a Gas Safe registered engineer.

Final thoughts – is the Ideal Logic Max System right for you?

The Logic Max System is the quiet overachiever of the mid-range system boiler market. At £1,150 for the 24kW with a 10-year warranty and the filter already in the box, it undercuts the Worcester Bosch Greenstar 4000 System by £50 and matches the Baxi 800 System on price – while offering the widest output range of any boiler in this comparison and the shallowest depth at 278mm.

The two areas where it falls short of rivals are LPG compatibility (the Logic Max is natural gas only – a dealbreaker for off-grid properties) and the heat exchanger material (aluminium rather than the stainless steel in the Baxi 800 System and Viessmann Vitodens 050-W). In hard water areas, that second point matters over a 10-15 year ownership period. For properties on mains gas in areas of normal water hardness, it’s a specification difference rather than a reliability risk.

The warranty call-out experience in the negative review pool is worth taking seriously if the household includes vulnerable people or has no backup heating. The product itself draws outstanding feedback; the after-sales response to a day-one fault does not. Raise the question of Ideal’s vulnerable household policy with your installer before committing.

FAQ