Head to head
Ariston Velis Evo 80 vs Telford Tempest 170 Direct
The Ariston Velis Evo 80 is a electric storage water heater, 80 litres. The Telford Tempest 170 Direct is a direct unvented hot water cylinder, 170 litres.
Last reviewed 13 September 2026
Specifications side by side
| Ariston Velis Evo 80 | Telford Tempest 170 Direct | |
|---|---|---|
| Capacity | 80 litres | 170 litres |
| Power | 1.5kW dual heating element (max 1.5kW draw at any time) | - |
| Heat-up time | shower ready in 50 minutes | - |
| Depth | 270 mm (slim twin-tank design) | - |
| Energy rating | B | - |
| Installation | requires the supplied unvented kit | - |
| Dimensions | - | 1200 mm high x 510 mm diameter (approx.) |
| Weight | - | 40 kg empty, 208 kg full |
| Immersion heater | - | 2 x 3kW, 240V single phase |
| Max inlet pressure | - | 3 bar (inlet control group) |
| Warranty | - | Lifetime guarantee on the cylinder (25 years internal), 2 years on components |
Sources: Ariston Velis Evo 80, Telford Tempest 170 Direct. 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 Tempest 170 Direct if...
A 170 litre direct unvented cylinder from Telford's Tempest range, built in duplex stainless steel with twin 3kW immersions rather than a boiler coil. It suits an all-electric property, and the cylinder body carries a lifetime guarantee when serviced annually.
Full Tempest 170 Direct specifications →Common questions
What is the difference between the Ariston Velis Evo 80 and the Telford Tempest 170 Direct?
The Ariston Velis Evo 80 is a electric storage water heater, 80 litres; the Telford Tempest 170 Direct is a direct unvented hot water cylinder, 170 litres.
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