Head to head
Heatrae Sadia Megaflo Eco 250 vs Vaillant ecoTEC plus 835 35kW combi
The Heatrae Sadia Megaflo Eco 250 is a indirect unvented hot water cylinder, 250 litres. The Vaillant ecoTEC plus 835 35kW combi is a gas combi boiler, 35 kw hot water output.
Last reviewed 13 September 2026
Specifications side by side
| Heatrae Sadia Megaflo Eco 250 | Vaillant ecoTEC plus 835 35kW combi | |
|---|---|---|
| Dimensions | 1738 x 579 x 600 mm (H x W x D) | 720 x 440 x 372 mm |
| Warranty | Lifetime guarantee in domestic installations | 10 years with Vaillant Advance Boiler Protection Kit |
| 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 | - | 35 kW |
| Central heating output | - | 32.8 kW |
| ErP class | - | A |
| Seasonal efficiency | - | 94% |
| Hot water flow rate | - | 14.3 litres per minute |
Sources: Heatrae Sadia Megaflo Eco 250, Vaillant ecoTEC plus 835 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 ecoTEC plus 835 35kW combi if...
A gas combi boiler with 35 kW of hot water output, sized for a larger house with two bathrooms. It delivers about 14.3 litres per minute of hot water, which decides how well a shower runs while a tap is on. Warranty: 10 years with Vaillant Advance Boiler Protection Kit. Seasonal efficiency is 94%.
Full ecoTEC plus 835 35kW combi specifications →Common questions
What is the difference between the Heatrae Sadia Megaflo Eco 250 and the Vaillant ecoTEC plus 835 35kW combi?
The Heatrae Sadia Megaflo Eco 250 is a indirect unvented hot water cylinder, 250 litres; the Vaillant ecoTEC plus 835 35kW combi is a gas combi boiler, 35 kW hot water output.
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