Ideal Logic+ System Boiler Cost with Installation
The Ideal Logic+ System costs approximately £1,050 for the 15kW, £1,150 for the 18kW, £1,250 for the 24kW, and £1,400 for the 30kW.
With installation costs of around £1,500, the total cost of the boiler and installation can cost anywhere between £2,550 and £2,900.
The Ideal Logic+ is the entry point into the Logic system boiler range – the same British-made platform as the Logic Max, same four outputs, same 93% efficiency and Quiet Mark accreditation, but without the 10-year standard warranty and without the filter in the box.
What the Logic+ has that the Max doesn’t is LPG compatibility via conversion kit, and a lower price. For most homeowners on mains gas planning a long ownership period, the Logic Max at around £100 more for the 18kW is the better call. For LPG properties or tighter budgets, the Logic+ makes a clear case.
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Discover more of the Ideal Logic+ system boiler specifications below:
| Ideal Logic+ System Boiler Product Table | |||||
 | Models | 15kW | 18kW | 24kW | 30kW |
 | Type | System | System | System | System |
| Fuel | Gas / LPG | Gas / LPG | Gas / LPG | Gas / LPG | |
| Condensing | Yes | Yes | Yes | Yes | |
| Efficiency rating (%) | 93 | 93 | 93 | 93 | |
| ErP | A | A | A | A | |
| LPG compatible | Yes (kit) | Yes (kit) | Yes (kit) | Yes (kit) | |
| Standard guarantee | 7 years | ||||
| Heat exchanger guarantee | 10 years (with filter) | ||||
| Max output (kW) | 15 | 18 | 24 | 30 | |
| DHW flow rate | Determined by cylinder | ||||
| Mounting | Wall-mounted | ||||
| Dimensions (mm) | 700 x 395 x 278 | ||||
| Typical price (incl. flue) | £1,050 | £1,150 | £1,250 | £1,400 | |
| Typical installation cost (incl. VAT) | £1,500 | ||||
| Total cost | £2,550 | £2,650 | £2,750 | £2,900 | |
*Terms and conditions apply.
Ideal Logic+ System Boiler overview
A system boiler stores heated water in a separate hot water cylinder, so multiple bathrooms can draw simultaneously without the flow rate ceiling of a combi. The Logic+ does this reliably and quietly across four outputs – its Quiet Mark accreditation is genuine, not marketing copy, and it’s one of the reasons it gets fitted in kitchens and utility rooms where noise would otherwise be a concern.
The 278mm depth is identical to the Logic Max and makes the Logic+ one of the shallower system boilers on the market. The main specification step-down from the Logic Max is the warranty: 7 years standard on the Logic+ versus 10 on the Logic Max, with the 10-year heat exchanger guarantee on the Logic+ only applying when an Ideal System Filter is fitted. For homeowners on LPG, the Logic+ is the relevant choice in the Ideal system boiler range – the Logic Max is gas only.
| Ideal Logic+ 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 |
Unlike a combi, the system boiler’s output is sized to your property’s heat loss rather than its hot water demand – the cylinder takes care of that side of things.
A Gas Safe engineer works out the right output from a heat loss calculation at survey stage, so don’t try to second-guess it from the number of radiators alone. The 24kW is a reasonable starting assumption for most three-bedroom homes, but older or less well-insulated properties often need more.
Key benefits at a glance
- ErP A-rated efficiency (93% efficient)
- British made
- Four outputs from 15kW to 30kW
- 7-year parts and labour warranty as standard
- 10-year heat exchanger warranty with Ideal System Filter
- LPG compatible via conversion kit – unlike the Logic Max
- 278mm depth – one of the shallower system boilers available
- Quiet Mark accredited
- Large digital display with service timer and fault code readout
- Front-access servicing
- Boiler frost protection
- Compatible with Ideal Halo smart thermostat, Nest, and Google Home
- Hydrogen blend ready (up to 20%)
Ideal Logic+ System Boiler technical specifications
The Logic+ platform is the foundation the Logic Max was built on. The engineering is sophisticated, well understood by Gas Safe engineers across the UK, and the service history is long enough to give a reliable picture of where faults tend to occur.
What it doesn’t include at this price is the high-resolution colour screen of the Logic² Max or the included filter – the display on the Logic+ is a backlit LCD rather than the colour screen, and the filter is a separate purchase.
Output and efficiency ratings
All four models run at 93% ErP A-rated efficiency. As condensing boilers, they recover heat from exhaust gases that older non-condensing boilers vented outside. The modulation range allows the boiler to turn down under low demand rather than cycling on and off, which is particularly noticeable in spring and autumn when the house needs less than full output.
Dimensions
700mm tall, 395mm wide, 278mm deep – identical to the Logic Max. That 278mm depth fits a standard 290mm deep kitchen cupboard with clearance and undercuts the Worcester Bosch Greenstar 4000 System (310mm) and the Baxi 800 System (285mm). The scratch-resistant casing and front-access servicing design are carried over from the Logic Max platform.
What’s under the casing
The heat exchanger carries a 10-year component guarantee when the boiler is installed with an Ideal System Filter – the filter must be purchased separately, unlike the Logic Max where it’s included in the box. The filter satisfies the UK Building Regulations requirement for a magnetic filter and activates the extended heat exchanger cover. Budget £80-£120 for a compatible filter and confirm it’s in the installation quote.
The large digital display shows system status, temperatures, service reminders, and fault codes. It includes a service timer with telephone number display – a practical detail for rental properties where tenants need to know who to call. Front-access servicing keeps annual maintenance straightforward without removing the boiler from the wall.
LPG compatibility is via a conversion kit, which must be installed by a Gas Safe engineer at commissioning. The kit is not included with the boiler and costs approximately £40-£60. Confirm at the quoting stage that your installer holds LPG certification in addition to Gas Safe registration.
Smart control is available via the Ideal Halo thermostat range via OpenTherm, and the boiler is also compatible with Nest and Google Home.
Prices and installation costs
The Ideal Logic+ System costs approximately £1,050 for the 15kW, £1,150 for the 18kW, £1,250 for the 24kW, and £1,400 for the 30kW – all including a standard horizontal side-wall flue. The Ideal System Filter is not included and should be added to the installation quote (£80-£120). If a vertical roof flue is required, budget an additional £300-£500.
Using a mid-range installation figure of £1,500:
| Ideal Logic+ System Boiler Costs | ||
| Output size | Unit cost (incl. flue) | Total (incl. installation) |
| 15kW | £1,050 | £2,550 |
| 18kW | £1,150 | £2,650 |
| 24kW | £1,250 | £2,750 |
| 30kW | £1,400 | £2,900 |
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.
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Warranty and support
Seven years parts and labour as standard, which is three years less than the Logic Max and requires the same conditions: register within 30 days of installation and service annually.
The heat exchanger extends to 10 years when an Ideal System Filter is fitted – but unlike the Logic Max, that filter isn’t in the box. It needs to be purchased and fitted separately, adding £80-£120 to the project cost. Factor it in from the quoting stage rather than treating it as optional.
Installation information
A like-for-like system boiler replacement on existing pipework is a one-day job. At 278mm deep the Logic+ is easy to manoeuvre into tight cupboard installations. If fitting a new cylinder at the same time, expect one to two days – and confirm your installer holds G3 unvented hot water qualification alongside Gas Safe registration. For LPG installations, LPG certification is additionally required.
What to expect on installation day
- Survey first. Boiler position, flue route, condensate pipe path, and cylinder compatibility confirmed. If LPG, confirm the conversion kit has been ordered and the engineer holds LPG certification.
- Out with the old. Drained, disconnected, and removed. Switching from a combi means cylinder pipework is run at this stage.
- In with the new. Mounted on the wall bracket. The Ideal System Filter is fitted separately – confirm this before the engineer leaves to activate the heat exchanger warranty.
- Controls. Ideal Halo, Nest, or Google Home paired and tested.
- Handover. Benchmark logbook completed. Boiler registered within 30 days. Confirm registration before the engineer leaves.
Do you need a system flush or filter?
A magnetic filter is mandatory under UK Building Regulations on any new boiler installation. Unlike the Logic Max, the Logic+ doesn’t include one – the Ideal System Filter needs to be purchased and fitted separately. Doing so simultaneously satisfies the Building Regulations requirement and activates the 10-year heat exchanger warranty.
Budget £80-£120 and confirm it’s in the installation quote before the job starts. A powerflush of existing pipework is strongly recommended on systems over ten years old, 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. For LPG installations, confirm LPG certification before booking. Use the WhatPrice quote service to be matched with vetted, Gas Safe registered installers in your area.
How the Ideal Logic+ System Boiler compares
| Ideal Logic+ System Boiler Comparison Table | |||
| Model | Ideal Logic+ System | Ideal Logic Max System | Baxi 600 System 2 |
| Typical unit price (24kW) | £1,250 | £1,350 | £1,150 |
| Heat exchanger | Aluminium | Aluminium | Stainless steel |
| Standard warranty | 7 years | 10 years | 7 years |
| Max warranty | 10 years (HE only) | 10 years | 7 years |
| Filter included | No | Yes | No |
| Built-in WiFi | No | No | No |
| App control | Ideal Halo (optional) | Ideal Halo (optional) | uSense 2 (optional) |
| Depth (mm) | 278 | 278 | 285 |
| LPG compatible | Yes (kit) | No | Yes (no kit) |
| Max output | 30kW | 30kW | 24kW |
For personalised guidance on choosing the right boiler, we recommend speaking with a Gas Safe registered engineer.
Final thoughts – is the Ideal Logic+ System right for you?
The Logic+ System is the right choice in two specific situations: LPG properties, where the Logic Max’s gas-only restriction makes the Logic+ the relevant Ideal system boiler; and budget-constrained purchases where the Logic Max’s 10-year warranty isn’t worth the £100 step up. Outside those two scenarios, the Logic Max is the better long-term investment – same dimensions, same efficiency, 10-year standard warranty, filter included.
Against the Baxi 600 System 2, the Logic+ is similarly priced at the 24kW and matches on warranty length (7 years standard). The Baxi 600 uses a stainless steel heat exchanger where the Logic+ uses aluminium – a meaningful long-term advantage in hard water areas. The Logic+ is shallower at 278mm vs 285mm and has LPG compatibility; the Baxi doesn’t require a kit. For properties in hard water areas on mains gas, the Baxi 600 is the stronger specification at a similar price. For LPG properties or softer water areas, the Logic+ is a well-priced alternative.
The filter situation is worth resolving at the quoting stage. The Logic+ doesn’t include one, but fitting an Ideal System Filter activates the 10-year heat exchanger guarantee and satisfies the Building Regulations requirement simultaneously. Factor £80-£120 into the project cost from the outset.
FAQ
What is the difference between the Ideal Logic+ and the Ideal Logic Max?
The Logic Max offers a 10-year standard warranty (vs 7 on the Logic+), includes the Ideal System Filter in the box, and has a high-resolution colour screen. The Logic+ is cheaper by around £150-£200 and offers LPG compatibility via conversion kit, which the Logic Max does not. For mains gas properties planning long-term ownership, the Logic Max is the better investment. For LPG properties or tighter budgets, the Logic+ is the right call.
Is the Ideal Logic+ System LPG compatible?
Yes, via a conversion kit fitted during installation. The kit costs approximately £40-£60 and must be installed by an LPG-certified Gas Safe engineer. This is one of the Logic+’s key advantages over the Logic Max, which is natural gas only.
Does the Ideal Logic+ System include a filter?
No. An Ideal System Filter must be purchased and fitted separately – budget £80-£120. Fitting it activates the 10-year heat exchanger guarantee and satisfies the UK Building Regulations requirement for a magnetic filter. Make sure it’s in the installation quote from the start.
Is the Ideal Logic+ System hydrogen-ready?
Yes. The boiler is certified for use with up to a 20% hydrogen blend in the gas supply.
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