Vogue Max or Logic Max System: the minimum output decides it
Ideal publishes both ends of the output range. The Vogue Max S15 turns down to 3.0 kilowatts and the Logic Max 15 to 4.8, which matters more than the warranty year count.
What this means
Both are system boilers with an Ideal System Filter and an A seasonal space heating efficiency class. The Vogue Max System publishes a 3.0 to 15.0 kilowatt output range at 70 degrees on the S15 and a warranty of 10 or 12 years; the Logic Max System publishes 4.8 to 15.0 on its 15 and a 10 year warranty. The turndown, the flue lengths, and the installer accreditation are what separate them.
Equipment and model context
Ideal Vogue Max System and Logic Max System
- Vogue Max System 15, 18, 26 and 32 kilowatt
- Logic Max System 15, 18, 24 and 30 kilowatt
Ideal Heating's United Kingdom system boiler ranges as published on the product pages. The two pages quote efficiency using different figures, so the efficiency comparison here is limited to the class both ranges share rather than to a percentage held against a percentage.
What this guide covers
- A small property where the smallest boiler in a range still looks oversized.
- A flat or a long horizontal flue run where the flue limit decides what can be fitted.
- Two quotations offering different Ideal ranges at similar prices.
What changes the answer
- Modulation range, not maximum output, is what decides whether a boiler cycles at low load.
- The two ranges publish different maximum flue lengths and different warranty conditions.
| Property | Vogue Max System | Logic Max System |
|---|---|---|
| Outputs | 15, 18, 26, 32 kilowatt | 15, 18, 24, 30 kilowatt |
| Smallest published output | 3.0 kilowatt on the S15 at 70 degrees | 4.8 kilowatt on the 15 at a 70 degree mean |
| Efficiency figures quoted | 92.4 to 93.2 percent | SEDBUK 89.4 to 89.7 percent |
| Seasonal space heating class | Class A | Class A |
| Maximum flue, horizontal and vertical | 10 metres and 10 metres | 9 metres and 7.5 metres |
| Warranty | 10 years, or 12 with a MAX Accredited Installer | 10 years |
The bottom of the range is the number that matters
Ideal publishes the Vogue Max System S15 at 3.0 to 15.0 kilowatts at 70 degrees. The Logic Max System 15 is published at 4.8 to 15.0 at a 70 degree mean. Same ceiling, and a floor 1.8 kilowatts apart.
A boiler cannot deliver less than its minimum. When the heat demand of the house falls below that figure, the burner fires, satisfies the demand quickly, and shuts down, then repeats. Each of those cycles has a purge and a light-off in it, which is where the efficiency of a condensing boiler leaks away.
In a well-insulated two-bedroom flat with a mild-day demand of three or four kilowatts, one of these boilers can modulate down to meet it and the other cannot. That is a comfort and running-cost difference that no warranty length compensates for.
Across the Logic Max range the floor stays at 4.8 kilowatts on the 15, 18, and 24 sizes and rises to 6.1 on the 30. Choosing a larger boiler for hot water reasons therefore raises the smallest heating output it can produce, which is the trade-off buried in a size decision.
Two efficiency figures that are not the same figure
Ideal quotes 92.4 to 93.2 percent for the Vogue Max System and SEDBUK figures of 89.4 to 89.7 percent for the Logic Max System. Both ranges are class A for seasonal space heating efficiency.
SEDBUK is a specific United Kingdom rating scheme with its own edition and method, so a SEDBUK percentage and an unqualified efficiency percentage are not two readings of one quantity. Subtracting one from the other produces a number that describes nothing.
The comparison that does hold is the class, and both ranges are A. Where a genuine efficiency difference between them exists at part load, it comes back to the modulation range rather than to either printed percentage.
Flue length is a siting constraint, not a specification detail
The Vogue Max System publishes maximum flue lengths of 10 metres horizontal and 10 metres vertical. The Logic Max System publishes 9 metres horizontal and 7.5 metres vertical.
Two and a half metres of vertical flue is the difference between a boiler that can sit in a ground-floor cupboard in a three-storey house and one that cannot. In a flat with an internal plant cupboard and a long run to an external wall, the horizontal figure does the same job.
This is the constraint that most often decides the range before anyone has looked at output. It is worth establishing from the proposed boiler position at survey stage rather than discovering on installation day.
What the warranty depends on
Both ranges require registration within 30 days of installation and annual servicing. The Logic Max System carries 10 years of parts and labour on those conditions. The Vogue Max System carries 10 or 12, with the 12 year term available when a MAX Accredited Installer fits the boiler.
That makes the extra two years a property of who installs it rather than of what is bought. Two quotations for the same Vogue Max System from installers on different sides of that accreditation are not offering the same product.
The annual service condition applies to both and to the whole term. A missed service in year six is not a year-six problem, it is a condition of the coverage that runs to year ten or twelve.
Where the extra money on the Vogue goes
Beyond the modulation range, the Vogue Max System carries a 3.5 inch full colour backlit display with plain text and graphics, and a service timer that holds the engineer's telephone number. The Logic Max System has a large high resolution colour screen with a service reminder.
Both include an Ideal System Filter, which is the component that keeps circulating debris out of the heat exchanger and which manufacturer warranties tend to reference. Its presence in both ranges removes one of the usual reasons to step up a tier.
Both are Class 6 NOx, and both offer LPG conversion, though Ideal lists that on the 18 and 30 kilowatt Logic Max models specifically rather than across that range.
| The property | What the published figures say |
|---|---|
| Small flat, low mild-day demand | Vogue Max, on the 3.0 kilowatt minimum |
| Long vertical flue run | Vogue Max, at 10 metres against 7.5 |
| Standard cupboard, short flue | Either. Logic Max is the compact cupboard fit |
| Large hot water demand | Vogue Max reaches 32 kilowatt, Logic Max 30 |
| An accredited installer available | Vogue Max, where the 12 year term becomes reachable |
| LPG conversion needed | Ideal lists it on the 18 and 30 kilowatt Logic Max models |
Two boilers with the same maximum can behave completely differently on a mild day, and the specification line that predicts it is the one most quotations leave out.
- Maximum outputSizes the coldest day and the hot water
- Minimum outputSets the lowest demand the boiler can match
- Demand below the minimumThe burner cycles rather than modulating
- Turndown ratioMaximum divided by minimum, per model
Questions people ask about this
What is the difference between Ideal Vogue Max and Logic Max system boilers?
Both carry an Ideal System Filter and an A seasonal space heating efficiency class. The Vogue Max System publishes a lower minimum output on its 15 kilowatt model, longer maximum flue lengths, a larger display, and a 12 year warranty option through an accredited installer.
Which Ideal boiler modulates the lowest?
Of the two ranges here, the Vogue Max System S15, which Ideal publishes at 3.0 to 15.0 kilowatts at 70 degrees. The Logic Max System 15 is published at 4.8 to 15.0 kilowatts at a 70 degree mean.
How do I get the 12 year Ideal warranty?
Ideal offers the 12 year term on the Vogue Max System when a MAX Accredited Installer fits the boiler. Both the 10 and 12 year terms also require registration within 30 days of installation and annual servicing.
How long can an Ideal Logic Max flue be?
Ideal publishes a maximum of 9 metres horizontal and 7.5 metres vertical for the Logic Max System, varying by model. The Vogue Max System publishes 10 metres in both directions.
Is the Vogue Max more efficient than the Logic Max?
The two pages quote efficiency using different figures, so the percentages cannot be subtracted from one another. Both ranges are class A for seasonal space heating efficiency, and the part-load difference between them comes from the modulation range rather than from the printed figures.
Evidence recordHow this page was checked
official manufacturer support article, operation manual · checked 2026-09-07
Every technical claim above was written from primary documentation held in the HVAC Bench evidence record: Ideal Heating technical literature. Where a source limits a definition to certain models, test conditions, or product classes, that limit is repeated here rather than generalised.
- Documentation class
- official manufacturer support article, operation manual
- Scope of the definition
- Ideal Vogue Max System and Logic Max System
- Last checked
- 2026-09-07