Worcester Bosch vs Ideal Logic Combi Boilers — Engineer Comparison
Worcester Bosch and Ideal Heating are the two most fitted combi boiler brands in Leeds and West Yorkshire. Here is an honest, unbiased engineer breakdown comparing build quality, cupboard dimensions, quiet running, warranties, kW sizing by bedroom count, and installed pricing.
Two proven British favourites — both available in sizes for any home
Both brands provide A-rated 94% efficiency, quiet operation, and up to 10-year warranties. Both offer outputs from 24kW to 35kW to match 1 to 4+ bedroom properties.
Worcester Bosch Greenstar
Greenstar 4000 & 8000 Range
- Quiet Mark certified — insulated casing for whisper-quiet running
- QuickTap water saver — reduces wait times and water waste at the tap
- Which? Best Buy winner for over a decade
- Available in 25kW, 30kW & 35kW+ — sized for 1 to 4+ bedroom homes
- Manufacturer warranty: Up to 10–12 years available
Ideal Logic Max Combi
Logic Max C24, C30 & C35
- Quiet in operation — Quiet Mark approved acoustic design (~48dB)
- Compact cupboard fit — 278mm slim depth fits standard 300mm wall units
- Ideal brass filter included — unlocks full 10-year manufacturer warranty
- Available in 24kW, 30kW & 35kW — sized for 1 to 4+ bedroom homes
- British built in Hull — affordable off-the-shelf local spare parts
Smooth power, quiet running and refined controls
Worcester Bosch is one of the most recognised domestic heating brands in the UK. The Greenstar series delivers high efficiency, quiet operation, and robust aftercare backup.
- Quiet Mark certified: Insulated casing keeps operating noise down to around 45dB, making it very quiet when fitted in kitchens, utility rooms, or near bedrooms.
- QuickTap water saving feature: Open the hot tap briefly and close it to signal the boiler. Within 20 seconds the heat exchanger is preheated so hot water flows quickly when turned back on.
- Aluminium-Silicon heat exchanger: Engineered for efficient heat transfer, wide internal waterways, and long service life.
- Nationwide engineer support: Dedicated manufacturer customer care network across Yorkshire.
Compact dimensions, quiet running and excellent value
Manufactured locally in Hull, Ideal Heating is one of the UK’s most popular boiler brands. The Logic Max series is designed for straightforward installation, low noise, and easy maintenance.
- Quiet Mark approved: The Logic Max is also Quiet Mark accredited and operates at low sound levels (~48dB), ensuring it runs quietly in open kitchens and living areas.
- Fits standard 300mm kitchen cupboards: At only 278mm deep and 395mm wide, it fits inside standard kitchen wall cupboards with room for ventilation and servicing.
- Ideal brass magnetic filter included: Comes with Ideal’s own system filter, protecting the central heating circuit and securing the 10-year manufacturer warranty.
- Clear digital display & mechanical front pressure gauge: Easy for homeowners to check pressure and monitor fault codes at a glance without taking off panels.
Worcester Bosch vs Ideal Logic comparison table
Compare technical specifications, dimensions, acoustic ratings, warranties, and starting prices side by side.
| Specification / Feature | Worcester Bosch Greenstar 4000 | Ideal Logic Max Combi |
|---|---|---|
| Starting Installed Price | From £1,795 | From £1,495 |
| Available Outputs (kW) | 25kW, 30kW (up to 35kW+ in 8000 series) | 24kW, 30kW, 35kW |
| Hot Water Flow Rate | 10.2 – 12.3 L/min (at 35°C rise) | 9.9 – 14.5 L/min (at 35°C rise) |
| Dimensions (H × W × D) | 724 × 400 × 310 mm | 700 × 395 × 278 mm |
| Fits Standard 300mm Cupboard? | Requires measuring (310mm deep) | Yes — compact cupboard fit (278mm) |
| Noise / Acoustic Rating | Quiet Mark certified (~45dB) | Quiet Mark certified (~48dB) |
| Water Saving Feature | QuickTap instantaneous preheat | Standard combi pre-heat function |
| Included System Filter | Worcester filter added to package | Ideal brass filter included (Max) |
| Manufacturer Warranty | Up to 10–12 Years | Up to 10 Years (Logic Max) |
| ErP Energy Efficiency | 94% (A-rated) | 94% (A-rated) |
| Smart Controls Compatibility | Bosch EasyControl, Hive, Nest, RF | Ideal Halo Wi-Fi / RF, Hive, Nest |
How to choose the right kW output for your bedrooms
Both Worcester Bosch and Ideal Logic are available in multiple power ratings. The right size is determined by how many bedrooms and bathrooms your home has — not by the boiler brand.
1 to 2 Bedrooms · 1 Bathroom
Recommended size: 24kW – 25kW (Ideal Logic C24 or Worcester Greenstar 25kW). Supplies ample heating for up to 10 radiators and gives a steady hot water flow rate of 9.9 to 10.2 litres per minute for a single shower or bath.
2 to 3 Bedrooms · 1 to 2 Bathrooms
Recommended size: 30kW (Ideal Logic C30 or Worcester Greenstar 30kW). The most common combi size in Leeds. Comfortably heats 10 to 15 radiators and delivers 12.2 to 12.5 litres of hot water per minute.
3 to 4+ Bedrooms · 2 Bathrooms
Recommended size: 35kW+ (Ideal Logic C35 or Worcester Greenstar 35kW / 8000). Heats up to 20 radiators and provides a high hot water flow of 14.3 to 14.5 litres per minute for homes with high hot water demand.
Choosing Between the Two Brands
Once you know the right kW output for your bedrooms, the choice comes down to installation location and preference: choose the Ideal Logic Max if you want a compact fit inside a standard 300mm kitchen cupboard with the filter included, or choose the Worcester Greenstar for QuickTap water-saving tech and ultra-quiet casing.
What’s included in an MD Gas Leeds installation
No hidden extras or unexpected add-ons on invoice day. Every boiler installation comes fully fitted and protected.
Fixed written quotation
We review your setup and give you an exact price in writing before you book. What we quote is what you pay.
Magnetic central heating filter
Traps sludge and circulating black iron oxide, protecting your new heat exchanger and validating the manufacturer warranty.
Chemical flush & inhibitor dosing
We thoroughly flush the central heating circuit and dose it with high-grade corrosion inhibitor to keep your system clean.
Wireless digital thermostat
Full room temperature control and 7-day programming so you can manage your heating schedule easily and save on energy bills.
Gas Safe registration & compliance
Your installation is registered directly with Gas Safe and Leeds Building Control, with all compliance certificates issued promptly.
Old boiler & packaging removal
We remove your redundant boiler, scrap pipework, and packaging, leaving your home spotless and ready to use.
Common questions about Worcester & Ideal boilers
How does the sound level compare between Worcester and Ideal?
Both boilers are very quiet modern appliances and both carry Quiet Mark accreditation. Worcester Bosch Greenstar units run at approximately 45dB, while the Ideal Logic Max runs at around 48dB. In everyday home environments — whether installed in a kitchen, cupboard, or utility room — both operate unobtrusively without distracting background noise.
Will an Ideal Logic combi fit inside my kitchen cupboard?
Yes. The Ideal Logic has a depth of only 278mm and a width of 395mm, making it purpose-designed to fit neatly inside standard 300mm deep British kitchen wall cabinets while maintaining the required clearances for airflow and servicing.
How long does a boiler replacement take?
A straight combi-to-combi swap in the same position is usually completed in a single working day (approx 6 to 8 hours), including draining down, chemical flushing, magnetic filter installation, electrical connections, testing, and commissioning. Converting from a traditional cylinder system to a combi takes around 1.5 to 2 days.
How do I protect my 10-year manufacturer warranty?
To keep manufacturer warranties valid (both Worcester and Ideal), two simple conditions apply: the boiler must be registered with the manufacturer within 30 days of installation (we register it for you), and it must receive an annual service by a Gas Safe registered engineer each year.
What size (kW) boiler do I need for my bedrooms and bathrooms?
For combi boilers, the kW rating determines hot water delivery: 24kW–25kW is ideal for 1–2 bedroom homes with 1 bathroom; 30kW is suited for 2–3 bedroom homes; and 35kW is best for 3–4+ bedroom homes with 2 bathrooms or higher hot water demand. Both Worcester and Ideal offer models across all three size brackets.
Get a fixed price on your new boiler
Send a photo of your existing boiler and flue on WhatsApp, or book a quick survey. We will provide a clear, fixed-price quote on Worcester and Ideal options with no sales pressure.