Head to head
Ariston Velis Evo 80 vs Heatrae Sadia Megaflo Eco 170
The Ariston Velis Evo 80 is a electric storage water heater, 80 litres. The Heatrae Sadia Megaflo Eco 170 is a indirect unvented hot water cylinder, 170 litres.
Last reviewed 13 September 2026
Specifications side by side
| Ariston Velis Evo 80 | Heatrae Sadia Megaflo Eco 170 | |
|---|---|---|
| Capacity | 80 litres | 170 litres |
| Heat-up time | shower ready in 50 minutes | 22 minutes (15 L/min recovery, 15C to 60C) |
| Power | 1.5kW dual heating element (max 1.5kW draw at any time) | - |
| Depth | 270 mm (slim twin-tank design) | - |
| Energy rating | B | - |
| Installation | requires the supplied unvented kit | - |
| Dimensions | - | 1384 x 579 x 600 mm (H x W x D) |
| Max inlet pressure | - | 1.6 MPa (16 bar) |
| Immersion heater | - | 3kW incoloy immersion, back-up |
| Warranty | - | Lifetime guarantee in domestic installations |
Sources: Ariston Velis Evo 80, Heatrae Sadia Megaflo Eco 170. Figures vary by model year and options, so check with the supplier before you commit.
Buy or hire the Velis Evo 80 if...
An 80 litre slimline electric storage water heater at only 270mm deep, suited to a flat, annexe or holiday let with no boiler-fed hot water. Its twin-tank design is quoted as giving more usable hot water than a standard single-tank heater of the same size.
Full Velis Evo 80 specifications →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 →Common questions
What is the difference between the Ariston Velis Evo 80 and the Heatrae Sadia Megaflo Eco 170?
The Ariston Velis Evo 80 is a electric storage water heater, 80 litres; the Heatrae Sadia Megaflo Eco 170 is a indirect unvented hot water cylinder, 170 litres.
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