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| Installation | Vertical |
|---|---|
| Actual Capacity (Litres) | 45/80 |
| Power (kW) | 1.5/1.5 |
| Body Colour | Polar White |
| Voltage (V) | 220-240 |
| Frequency (Hz) | 50 |
| V40 (I) | 77 |
| IP Protection | IPX4 |
| Max Working Temp (°C) | 65 |
| Energy Rating | B |
| Tapping Profile | M |
| Warranty | 5 Years |
| Aqua Ariston NET Compatibility | Yes |
| Heating Times | 1hm |
| Standing Losses [kWh/24]@65c | 0.96 |
Home > Water Heaters > Electric Water Heaters > Ariston Velis Evo 45L Unvented Electric Water Heater
Compact 45L twin tank design in an ultra-slim 27cm profile. Heats fully in just 1 hour. Eco Evo auto-learning saves up to 14% on energy bills. Dual 1.5kW elements. Anti-legionella. Ideal for cloakrooms, small flats and leisure installations. 5-year Ariston guarantee. Unvented kit included.
The 45L model heats from cold in just 1 hour — almost twice as fast as the 80L version. Perfect where you need a quick heat-up with limited waiting time or a small top-up between uses.
At just 776mm tall and 275mm deep, the 45L is one of the most compact unvented electric water heaters available. Fits under kitchen worktops, inside bathroom cabinets and in tight utility spaces.
Two stacked tanks reduce cold water stratification, delivering 77 litres of V40 mixed water from a 45L tank — 16% more usable hot water than a standard 45L single-tank cylinder.
The integrated auto-learning software memorises your weekly hot water usage and adjusts the heating schedule automatically, saving up to 14% on energy without any manual programming.
Maximum draw of 1.5kW at any one time. Safe for standard domestic circuits and leisure park hook-ups. Faster reheat than single-element models of equivalent capacity.
Periodic heating to 65°C prevents legionella bacteria growth. IPX4 rated — can be installed in bathrooms and wet rooms outside Zones 0 and 1 per BS 7671 wiring regulations.
With its tiny footprint and 1.5kW maximum draw, the 45L Velis Evo is perfect for glamping pods, holiday cabins, mobile homes, studio flats, and any installation where space and power supply are restricted.
B energy rating is best-in-class for electric storage water heaters at this capacity. The Eco Evo function enhances efficiency further, ensuring you only heat water when you actually need it.
All data confirmed from the official Ariston Velis Evo product datasheet. Ariston product code: 3626305.
Capacity & Performance
| Specification | Velis Evo 45L |
|---|---|
| Actual Capacity | 45 Litres |
| V40 (Mixed Water at 40°C) | 77 Litres |
| Heating Time (ΔT=45°C) | 1 hour |
| Maximum Working Temperature | 65°C |
| Standing Losses (@65°C) | 0.96 kWh / 24h |
| Tapping Profile | M |
Electrical & Energy
| Specification | Velis Evo 45L |
|---|---|
| Energy Rating (ErP) | B |
| Heating Element Power | 1.5kW / 1.5kW (Dual Element) |
| Maximum Power Draw | 1.5kW at any one time |
| Voltage | 220–240V |
| Frequency | 50/60 Hz |
| IP Rating | IPX4 — Splash protected |
Physical & Connections
| Specification | Velis Evo 45L |
|---|---|
| Height | 776mm |
| Width | 405mm |
| Depth | 275mm (Ultra-Slim) |
| Cold Water Inlet | G 1/2" |
| Hot Water Outlet | G 1/2" |
| Body Colour | Polar White |
| Installation | Wall Mounted — Vertical only |
Product & Supply Information
| Specification | Detail |
|---|---|
| Ariston Product Code | 3626305 |
| Product Type | Unvented Electric Storage Water Heater — Twin Tank |
| Eco Evo Smart Function | Yes — up to 14% energy savings |
| Anti-Legionella Function | Yes — periodic heating to 65°C |
| ABS Safety System (Anti-Burn) | Yes |
| Aqua Ariston Net / WiFi | No — standard model has no WiFi |
| Unvented Kit | Yes — supplied in box (mandatory) |
| Manufacturer Guarantee | 5 Years — Ariston UK |
| Installation Type | Wall mounted — Vertical only |
| Dimensions (H × W × D) | 776 × 405 × 275mm |
| Cold Water Inlet Connection | G 1/2" |
| Hot Water Outlet Connection | G 1/2" |
| Electrical Supply | 220–240V / 50–60Hz |
| Maximum Power Draw | 1.5kW |
| IP Rating | IPX4 — Suitable outside Zones 0 & 1 in bathrooms |
| Unvented Kit | Included in box — MUST be fitted |
| Box Contents | Water heater unit + Unvented installation kit + Installation brackets |
| Model | Capacity | V40 (Mixed Water) | Heating Time | Dimensions (H×W×D) | Standing Loss |
|---|---|---|---|---|---|
| Velis Evo 45L — THIS PRODUCT | 45 Litres | 77 Litres | 1 hour | 776 × 405 × 275mm | 0.96 kWh/24h |
| Velis Evo 80L | 80 Litres | 115 Litres | 1h 52m | 1251 × 506 × 275mm | 1.32 kWh/24h |
| Application | Recommended Capacity | 45L Suitable? |
|---|---|---|
| Single basin / Sink only | 15–30L | Slight overkill but usable |
| Glamping pod / Single shower (small) | 30–45L | ✓ Ideal |
| Studio flat / 1 person | 30–45L | ✓ Ideal |
| Small flat / Couple | 45–80L | ✓ Suitable |
| Family home / Multiple showers | 80L+ | Undersized — consider 80L |
Not sure which capacity is right? Call our heating experts on 01282 429061 Mon–Fri for free advice.
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| Free Delivery | Free delivery on all orders over £500 — UK mainland |
| Standard Delivery | Charged on orders under £500 — calculated at checkout |
| Delivery Area | UK mainland only. Not to Northern Ireland, Scottish Highlands, Channel Islands or overseas |
| Lead Time | Up to 14 working days. Call 01282 429061 to confirm availability |
| ⚠ Important | Do not open the packaging until your installer has confirmed this is the correct model. We cannot accept returns of water heaters once the packaging has been opened. |
| Finance | Klarna and Clearpay available at checkout |
| Returns Window | 14 days from receipt — unopened packaging only |
| Water Heaters | Cannot be returned once packaging is opened. Confirm correct model with installer before opening. |
| Return Postage | Customer's responsibility. Original delivery charges non-refundable. |
| Restocking Charge | 25% may apply to non-faulty returns |
| Faulty Items | Sent to manufacturer for testing. If confirmed faulty, 100% of original product value credited. |
| Guarantee Claims | Contact Ariston UK direct: 03332 407 777 |
