Head to head
Heatrae Sadia Megaflo Eco 170 vs Vaillant ecoFIT pure 835 35kW combi
The Heatrae Sadia Megaflo Eco 170 is a indirect unvented hot water cylinder, 170 litres. The Vaillant ecoFIT pure 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 170 | Vaillant ecoFIT pure 835 35kW combi | |
|---|---|---|
| Dimensions | 1384 x 579 x 600 mm (H x W x D) | 700 x 390 x 295 mm |
| Warranty | Lifetime guarantee in domestic installations | 10 years when installed by Vaillant Advance installer |
| 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 | - | 35 kW |
| Central heating output | - | 26.7 kW |
| ErP class | - | A |
| Seasonal efficiency | - | 94% |
| Weight | - | 33 kg |
| Hot water flow rate | - | 14.1 litres per minute |
Sources: Heatrae Sadia Megaflo Eco 170, Vaillant ecoFIT pure 835 35kW 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 ecoFIT pure 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 14.1 litres per minute of hot water, which decides how well a shower runs while a tap is on. Warranty: 10 years when installed by Vaillant Advance installer. Seasonal efficiency is 94%.
Full ecoFIT pure 835 35kW combi specifications →Common questions
What is the difference between the Heatrae Sadia Megaflo Eco 170 and the Vaillant ecoFIT pure 835 35kW combi?
The Heatrae Sadia Megaflo Eco 170 is a indirect unvented hot water cylinder, 170 litres; the Vaillant ecoFIT pure 835 35kW combi is a gas combi boiler, 35 kW hot water output.
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