Head to head
Heatrae Sadia Megaflo Eco 170 vs Worcester Bosch Greenstar 4000 30kW combi
The Heatrae Sadia Megaflo Eco 170 is a indirect unvented hot water cylinder, 170 litres. The Worcester Bosch Greenstar 4000 30kW combi is a gas combi boiler, 30 kw hot water output.
Last reviewed 13 September 2026
Specifications side by side
| Heatrae Sadia Megaflo Eco 170 | Worcester Bosch Greenstar 4000 30kW combi | |
|---|---|---|
| Dimensions | 1384 x 579 x 600 mm (H x W x D) | 710 x 400 x 310 mm |
| Warranty | Lifetime guarantee in domestic installations | 10 years |
| Capacity | 170 litres | - |
| Heat-up time | 22 minutes (15 L/min recovery, 15C to 60C) | - |
| Max inlet pressure | 1.6 MPa (16 bar) | - |
| Immersion heater | 3kW incoloy immersion, back-up | - |
| Hot water output | - | 30 kW |
| Central heating output | - | 30 kW |
| ErP class | - | A |
| Seasonal efficiency | - | 94% |
| Weight | - | 32.3 kg |
| Hot water flow rate | - | 12.3 litres per minute |
Sources: Heatrae Sadia Megaflo Eco 170, Worcester Bosch Greenstar 4000 30kW combi. Figures vary by model year and options, so check with the supplier before you commit.
Buy or hire the Megaflo Eco 170 if...
A 170 litre indirect unvented cylinder from Heatrae Sadia's Megaflo Eco range, one of the most fitted cylinder brands in the UK. It reheats in about 22 minutes at a 15 litre/min flow rate and carries a lifetime guarantee in a domestic installation.
Full Megaflo Eco 170 specifications →Buy or hire the Greenstar 4000 30kW combi if...
A gas combi boiler with 30 kW of hot water output, sized for a three-bed house with one or two bathrooms. It delivers about 12.3 litres per minute of hot water, which decides how well a shower runs while a tap is on. Warranty: 10 years. Seasonal efficiency is 94%.
Full Greenstar 4000 30kW combi specifications →Common questions
What is the difference between the Heatrae Sadia Megaflo Eco 170 and the Worcester Bosch Greenstar 4000 30kW combi?
The Heatrae Sadia Megaflo Eco 170 is a indirect unvented hot water cylinder, 170 litres; the Worcester Bosch Greenstar 4000 30kW combi is a gas combi boiler, 30 kW hot water output.
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