Ideal Logic & Vogue • Engineering Sizer

Ideal Boiler Size Calculator: Logic & Vogue Models

Q: What is the difference between Ideal Logic Plus and Logic Max?

The Logic Max comes with an Ideal magnetic system filter included in the box and an upgraded 10-year warranty (compared to 7 years on the Logic Plus).

Q: What size Ideal boiler for a 3-bed house?

The Ideal Logic Max Combi 30 is the most popular and optimal size for a standard 3-bedroom home.

Select the optimal Ideal Heating boiler model and kilowatt rating for British homes.

Ideal Heating Technical Engineering Standards • BS EN 12831 Verified • Dual Unit (kW & BTU)

Manufacturer Product Range

Ideal Heating Sizing Matrix & Model Lineup

Official Technical Specs

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Independent Engineering Guide: Boiler Size Calculator is an independent sizing resource and is NOT affiliated with, authorized, endorsed, or sponsored by Ideal Heating / Groupe Atlantic.

Ideal Heating is one of the UK's highest-volume boiler manufacturers. The Logic and Vogue ranges are popular for straightforward installation and reliable domestic sizing.

Model Range	Boiler Type	Available Outputs	DHW Flow Rate	Modulation Turndown	Standard Warranty	Optimal Property Archetype
Logic+ / Logic Max	Combi, System, Heat-Only	24 kW, 30 kW, 35 kW	9.9 – 14.5 L/min	1:5 (4.8 kW min)	7–10 Years	Standard Cupboard-Fit Replacements
Vogue Gen2 / Vogue Max	Combi & System	26 kW, 32 kW, 40 kW	10.6 – 16.4 L/min	1:7 (3.7 kW min)	10–12 Years	Premium Domestic Long-Warranty Installations

Burner Engineering

Boiler Modulation & Turndown Ratio (1:3 vs 1:10)

Anti-Cycling Firing Physics

The maximum kW rating of your boiler only matters on the 3 or 4 coldest days of winter. For the remaining 95% of the heating season, your home requires just 2 kW to 6 kW of continuous heat. A high modulation turndown ratio (1:7 to 1:10) allows the burner to throttle down to a tiny flame without shutting off, preventing short-cycling and saving money.

Simulate Outdoor Seasonal Temperature: +8°C (Mild Autumn / Spring Day)

-5°C (Freezing Winter Peak - 10 kW Load) +8°C (Typical Season - 4.5 kW Load) +16°C (Mild Spring - 1.8 kW Load)

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Current Real-Time Heating Demand

House Needs 4.5 kW of Thermal Power

Target Room Temp: 21°C Constant

Narrow 1:3 Modulation

Budget / Older Boiler (1:3 Turndown)

Rated: 30 kW Maximum → 10 kW Minimum Limit. Because the house only needs 4.5 kW, the 10 kW burner overheats the water in 2 minutes and cuts out repeatedly.

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Burner Output 10.0 kW (Minimum)

Short-Cycling (18/hr)

Ignition Cycles / Hour: 16 – 20 cycles

Return Water Temp: 62°C (Condensing Off)

Seasonal Gas Efficiency: 82.5%

❌ Rated: 30 kW Maximum → 10 kW Minimum Limit. Because the house only needs 4.5 kW, the 10 kW burner overheats the water in 2 minutes and cuts out repeatedly.

Elite 1:10 Modulation

Premium Boiler (1:10 Turndown)

Rated: 30 kW Maximum → 3.0 kW Minimum Limit. Burner modulates smoothly to match the exact demand, sustaining condensing mode without stopping.

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Burner Output 4.5 kW (Perfect Match)

Continuous Smooth Burn

Ignition Cycles / Hour: 1 continuous cycle

Return Water Temp: 46°C (Peak Condensing)

Seasonal Gas Efficiency: 94.2%

✅ Rated: 30 kW Maximum → 3.0 kW Minimum Limit. Burner modulates smoothly to match the exact demand, sustaining condensing mode without stopping.

Thermodynamic Methodology

Ideal Logic Compact Dimensions Sizing Formula & Variables

Ideal Technical Specs

Mathematical Formulation

Compact_Width = 395mm × Depth 278mm (Fits Standard 300mm Cupboard)

Ideal Logic Max combi boilers are among the most compact on the market, fitting into standard 300mm kitchen wall cupboards while providing up to 35 kW.

Logic_Plus

Standard compact combi / system (24, 30, 35 kW) Unit: 7 Year Warranty

Logic_Max

Compact combi with Ideal filter (24, 30, 35 kW) Unit: 10 Year Warranty

Vogue_Max

Premium heavy-duty stainless steel combi (26, 32, 40 kW) Unit: 12 Year Warranty

Lookup Standards

Ideal Heating Boiler Sizing & Specifications

Complete line-up of Ideal Logic and Vogue combi, system, and heat-only boilers.

Ideal Boiler Model	Heating kW Output	DHW Output (kW)	Hot Water Flow Rate	Standard Warranty
Ideal Logic Max Combi 24	24.2 kW	24.2 kW	9.9 L/min @ 35°C	10 Years Warranty
Ideal Logic Max Combi 30	24.2 kW	30.3 kW	12.4 L/min @ 35°C	10 Years Warranty
Ideal Logic Max Combi 35	24.2 kW	35.3 kW	14.5 L/min @ 35°C	10 Years Warranty
Ideal Vogue Max Combi 40	32.0 kW	40.0 kW	16.4 L/min @ 35°C	12 Years Warranty
Ideal Logic Max System 24	24.2 kW	Paired Cylinder	High Mains Pressure	10 Years Warranty

Logic Max includes Ideal System Filter in the box for full warranty validation.

Key Principles

Critical Sizing Factors & Engineering Influences

Core hardware and load parameters governing model selection, benchmarked against Ideal Heating Technical Engineering Standards.

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Queen’s Award for Enterprise Winner

Manufactured in Hull, UK, the Logic series is one of the most widely fitted boilers in British social and private housing.

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Easy-to-Read High Resolution Digital Display

Displays clear plain-text service diagnostics and fault history for quick maintenance.

Prevent Costly Errors

Common Sizing Mistakes & How to Avoid Them

Common installer miscalculations when specifying Ideal Boiler Size Calculator: Logic & Vogue Models equipment — specification mismatches that surface only after the unit is installed and commissioned.

Common Pitfall

Forgetting to Service Annually

Consequence: Ideal warranty requires annual servicing logged on the Benchmark portal.

Correct Approach: Schedule annual maintenance with an accredited Gas Safe engineer.

Quality Assurance Audit

Ideal Boiler Size Calculator: Logic & Vogue Models: Installer Consultation Audit

Review these 2 essential questions with your heating installer to ensure your Ideal Boiler Size Calculator: Logic & Vogue Models quote meets Ideal Heating Technical Engineering Standards.

Readiness Score: 0 / 2

Ideal System Filter Fitted Included in the Logic Max box to ensure 10-year warranty coverage.

Digital PRV Pressure Checked (1.0–1.5 bar) Verified on front LCD pressure gauge.

Technical Deep Dive

Ideal Heating British Manufacturing & Sizing Advice

Ideal Heating manufactures reliable, compact boilers in the UK. The Logic Max 30 is the sweet spot for the majority of 3-bedroom semi-detached British homes.

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CIBSE & BS EN Standards-Compliant Framework BENCHMARKED

Formulations benchmarked directly against published British & European standards: Ideal Heating Technical Engineering Standards (Ideal Heating UK & Gas Safe Register) for Ideal Boiler Size Calculator: Logic & Vogue Models. Maintained by the Boiler Size Calculator Technical Editorial Desk.

About Our Team • Editorial Policy • Suggest Correction

Standards Revision: 2026

FAQ Knowledgebase

Frequently Asked Questions

Direct engineering guidance for common ideal boiler size calculator: logic & vogue models questions, referenced against Ideal Heating UK & Gas Safe Register.

What is the difference between Ideal Logic Plus and Logic Max?

What size Ideal boiler for a 3-bed house?

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