Worcester, Vaillant & Ideal
Which brand is right for you?
We compare the top 3 models from each brand — entry, mid-range and premium — so you know exactly what you're getting before you book.
Worcester Bosch
UK's #1 Best-Selling Boiler Brand
Which? Best Buy for 10+ consecutive years. Founded 1962, Worcester Bosch are renowned for reliability, installer support, and industry-leading warranties.
Quick Model Comparison
| Feature | Greenstar 2000 | Greenstar 4000★ | Greenstar 8000★ |
|---|---|---|---|
| Outputs | 25kW / 30kW | 25kW / 30kW | 30kW / 35kW / 40kW / 45kW / 50kW |
| Efficiency | 93% ErP A | 94% ErP A | 94% ErP A |
| Warranty | Up to 6 years | Up to 10 years | Up to 10 years |
| Flow Rate | — | ~11 L/min | Up to 20 L/min |
| Cupboard Fit | |||
| Wireless Control | |||
| Colour Display | |||
| Smart Thermostat | |||
| Price (fitted) | From ~£2,045 fitted | From ~£2,265 fitted | From ~£2,845 fitted |
Greenstar 2000
Worcester's budget-friendly entry point. Same sleek exterior as the range but stripped of premium features. Ideal for small properties.
Outputs
25kW, 30kW
Efficiency
93% ErP A
Warranty
Up to 6 years
Flow Rate
—
Best for:
Small homes, flats & 1-bathroom properties on a budget
From ~£2,045 fitted
Greenstar 4000
Our most recommended Worcester. Replaced the best-selling Greenstar i. Wireless-ready, 10-yr warranty, and full colour display — outstanding value.
Outputs
25kW, 30kW
Efficiency
94% ErP A
Warranty
Up to 10 years
Flow Rate
~11 L/min
Best for:
Small to medium homes — the everyday all-rounder
From ~£2,265 fitted
Greenstar 8000
No-compromise performance for large homes. The 8000 offers the widest output range, premium connectivity and Worcester's finest engineering.
Outputs
30kW, 35kW, 40kW, 45kW, 50kW
Efficiency
94% ErP A
Warranty
Up to 10 years
Flow Rate
Up to 20 L/min
Best for:
Large homes, multiple bathrooms, high hot water demand
From ~£2,845 fitted