Head to head
Heatrae Sadia Megaflo Eco 250 vs Viessmann Vitodens 100-W 35kW combi
The Heatrae Sadia Megaflo Eco 250 is a indirect unvented hot water cylinder, 250 litres. The Viessmann Vitodens 100-W 35kW combi is a gas combi boiler, 34.9 kw hot water output.
Last reviewed 13 September 2026
Specifications side by side
| Heatrae Sadia Megaflo Eco 250 | Viessmann Vitodens 100-W 35kW combi | |
|---|---|---|
| Dimensions | 1738 x 579 x 600 mm (H x W x D) | 700 x 400 x 360 mm |
| Warranty | Lifetime guarantee in domestic installations | 5 years |
| Capacity | 250 litres | - |
| Heat-up time | 34 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 | - | 34.9 kW |
| Central heating output | - | 32 kW |
| ErP class | - | A |
| Seasonal efficiency | - | 98% |
| Weight | - | 35 kg |
| Hot water flow rate | - | 17 litres per minute |
Sources: Heatrae Sadia Megaflo Eco 250, Viessmann Vitodens 100-W 35kW combi. Figures vary by model year and options, so check with the supplier before you commit.
Buy or hire the Megaflo Eco 250 if...
A 250 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 34 minutes at a 15 litre/min flow rate and carries a lifetime guarantee in a domestic installation.
Full Megaflo Eco 250 specifications →Buy or hire the Vitodens 100-W 35kW combi if...
A gas combi boiler with 34.9 kW of hot water output, sized for a larger house with two bathrooms. It delivers about 17 litres per minute of hot water, which decides how well a shower runs while a tap is on. Warranty: 5 years. Seasonal efficiency is 98%.
Full Vitodens 100-W 35kW combi specifications →Common questions
What is the difference between the Heatrae Sadia Megaflo Eco 250 and the Viessmann Vitodens 100-W 35kW combi?
The Heatrae Sadia Megaflo Eco 250 is a indirect unvented hot water cylinder, 250 litres; the Viessmann Vitodens 100-W 35kW combi is a gas combi boiler, 34.9 kW hot water output.
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