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5 min read

Ideal Logic Max 30kW Combi Review

Published on
17 December 2025
The Ideal heating logo on a black background, with two images of an Ideal Logic Max 30 over the top
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Thinking about a new boiler?

If you’re exploring your options, we can give you a fixed-price boiler quote in under a minute, with next-day installation available.

Looking for a new combi but not sure where to start?

In our review of the Ideal Logic Max Combi C30, we’ll explain: 

  • Our review in summary, is this the best combi boiler you can buy?
  • Which properties the 30kW Logic Max is most suited to
  • How much you should expect to pay (including installation)
  • The top features that make the Ideal Logic Max a market leader

In Summary: The Ideal Logic Max 30kW Combi Boiler

An image of the Ideal Logic Max 30kW Combi Boiler

The Ideal Logic Max 30kW Combi is suitable for medium sized properties, such as a 3-bedroom semi-detached with 1 shower and around 12 radiators. They offer 3 versions: C24, C30 and C35. So, if you have more or less hot water and heating demand, the C24 or C35 may be more suitable.Being a premium boiler, expect the price of the Logic Max to be around £200 more than low-end boilers. Low-end boilers will come with a warranty that’s as little as 2-years, not to mention they’re not as robust, with prices starting at around £2,300 including installation. Installation costs for the Logic Max are likely to be around £2,500. However, it’ll come inclusive of a 10-year warranty.The feature list of the Logic Max includes, but certainly isn’t limited to: 

  • Lengthy 10-year warranty, protecting you from expensive repair bills
  • Compact design, so it will fit in a kitchen cupboard
  • WiFi compatibility, perfect to integrate into your smart home
  • Excellent brand recognition (4.8/5 stars across 52,000+ online reviews)
  • High efficiency, with potential savings of up to £290 per year
  • Specs include a high flow rate, as well as power modulation to save energy

Put simply, the Ideal Max is one of the best combi boilers money can buy!Use our clickable form to get Ideal boiler prices on-screen. 

Ideal Logic Max Combi Property Suitability

Image of branging, the Logic Max Combi

The Ideal Logic Max Combi boiler comes in a couple of different sizes: 

  • C24: 24kW
  • C30: 30kW
  • C35: 35kW

The 30kW unit we’re focusing on for this review is best suited to medium sized properties, whereby only 1 shower is likely to be running at once. As an example, a suitable property would be a 3-bedroom house with 1 shower and approximately 12 radiators. The 30kW version of the Ideal Logic Max supplies 30.3kW of domestic hot water (DHW) output and DHW flow rate of 12.4L at 35ºC. It’s unlikely that this would be able to keep up with the hot water demand of 2 showers. To power 2 showers simultaneously, you’ll need the 35kW Logic Max, which has a slightly higher output of 35.3kW and up to 14.5L flow rate.The flow rate is going to be the deciding factor on whether or not you choose the 30kW versus the 35kW unit. And that’s because their heating output is similar: 

  • 30kW - Power modulation from 6.4-25.6kW
  • 35kW - Power modulation from 7.5-25.6kW

Put simply, in terms of powering central heating / radiators, they’ll be able to power similarly sized systems. Boiler sizing can be incredibly confusing. That’s why we’ve made this boiler configuration tool which determines exactly what size Ideal combi boiler you need for your property.

Ideal Logic Max Boiler Installation Costs

The Ideal Logic Max Combi range is up there with the flagship products offered by other leading brands such as:

  • Worcester Bosch
  • Viessmann
  • Vaillant
  • Glow-Worm

A typical heating and plumbing merchant will sell this unit for £1,300-£1,400 (boiler only). By the time you’ve added copper fittings, a flue, thermostat and labour, the overall installation cost is likely to be in the £2,500-£2,700 range. Installations from Dwellow include: 

  • Pipework upgrades
  • New flue
  • Chemical flush
  • Boiler filter
  • Thermostat
  • Warranty registration
  • 12-month workmanship warranty

Get prices on Ideal combi boilers and compare them directly to other brands by using our clickable tool here. Or, understand why prices for a new boiler vary by reading our guide to boiler installation costs here

Top Features

Below, we’ll cover the top reasons to fit an Ideal Logic Max Combi in your property.

Long 10-Year Warranty

An image of the Ideal Heating offer of a 10 year warranty on their Logic Max boiler

Low-end boilers will come with a warranty of as little as 2-years. Mid-range boilers tend to come with 5-years or more. At the high-end, you’ll get anywhere from 7-10 years. The Ideal Logic Max C24, C30 and C35 all come with a lengthy 10-year warranty. It's always worth paying a small premium for a boiler with a long warranty. And that's simply because boiler repair costs can spiral out of control quickly. Here are a couple of example repairs (and estimated repair costs) for an average combi boiler: 

  • Fan: £300
  • Gas valve: £250
  • Printed circuit board (PCB): £400-£500
  • Heat exchanger: £400-£500

This is exactly what a long boiler warranty, such as the one offered by Ideal on the Logic Max Combi, is going to be protecting you from. All the boilers we fit come with a long warranty. Get prices on the most suitable boiler for your property by using this clickable form here

Online Reviews

Not heard of Ideal Heating?

They’re one of the leading brands in the heating space. They compete directly with Worcester Bosch, Vaillant, Viessmann and other leading brands. 

A screenshot of the Ideal Heating Trust Pilot page, showing 4.8 stars out of 5

Over 90% of consumers on Trustpilot rate Ideal Heating as 5-star, with an average rating of 4.8 from over 52,000 reviews!

Compact Fit

Not all combi boilers are considered “compact”. Typically, a compact boiler would be no more than 700mm wide, allowing it to fit in a kitchen cupboard. 
The Ideal Logic Max Combi boiler range has dimensions of 700mm x 395mm x 278mm. So, if you need this boiler to fit into small spaces such as a kitchen cupboard, it’s small enough so that can happen!

Wi-Fi Compatible 

An image of the Ideal Halo Smart Controller

All Logic Max boilers come complete with Wi-Fi compatibility, and can be used alongside the Halo smart programmable room thermostat range.Using the Ideal app (available on both Apple Store and Google Play), you'll be able to control and monitor your heating and hot water on the move. There's a Halo thermostat for all scenarios and every budget, even for those properties that work by using zoned heating systems.

High Efficiency = Low Energy Bills

Old boilers are incredibly inefficient. G-rated boilers are the worst, with energy efficiency sometimes being below 70%. That means for every 1 kWh of gas consumed, they only produce a maximum of 0.70 kWh of heat. 

A bar chart from Energy Saving Trust showing how much you could save if you fitted an A-rated boiler in the place of your old D-G rated boiler

The graphic above from the Energy Saving Trust shows how much you could save if you fitted an A-rated boiler in the place of your old D-G rated boiler. With a seasonal space heating energy efficiency of 94%, you could save up to £290 per year on your heating bills by fitting an Ideal Logic Max Combi.Combine that with the 10-year warranty (protecting you from expensive repair bills), and your savings will more than cover finance repayments if that’s the payment route you take. 
Find more about boiler finance here. Or, get a quote on your A-rated boiler using our clickable form here

Specifications

To compare the specifications of the 24kW, 30kW and 35kW Logic Max combi boilers directly, we’ve included the spec sheet which can be found on Ideal’s website here

Specification 24kW 30kW 35kW
Weight (Packaged) kg 32.8 33 33
Max Installation Weight kg 28.5 28.6 28.6
CH Output (kW) min/max mean 70ºC 4.8-24.2 6.1-24.2 7.1-24.2
CH Output (kW) min/max mean 40ºC 5.1-25.6 6.4-25.6 7.5-25.6
DHW Output (kW) max 24.2 30.3 35.3
DHW Flow Rate l/min 35ºC 9.9 12.4 14.5
SEDBUK Rating (2005) % 91.1 91.1 91.1
SEDBUK Rating (2009/2012) % 89.6 89.6 89.6
NOx Classification Class 6 Class 6 Class 6
LPG Conversion Yes Yes Yes
Max Horizontal Flue 9m 8m 6m
Max Vertical Flue 7.7m 7.5m 7.5m
Seasonal Space Heating Efficiency Class A A A
Seasonal Space Heating Energy Efficiency µs % 94 94 94
Sound Power Level Indoors LWA dB(A) 50 46 46
Water Heating Energy Efficiency Class A A A

Still not sure which size Ideal Logic Max is suitable for your property?

Simply use our boiler configuration tool here. 

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