The Ferroli SEV 50 is a 50-litre vertical unvented electric water heater supplied complete with a G3 expansion kit — everything needed for a fully Building Regulations G3 compliant installation, straight from the box. Built with a titanium-healthy blue silicone glass-lined inner vessel and a stainless steel heating element rated to 3 kW at 240 V, the SEV50 delivers reliable hot water storage for studios, small flats, and single-occupant all-electric homes. With an IPX4 splash-proof rating and shockproof ABS casing, it suits bathroom and utility-room installations alike.

47.5 L

Actual capacity

3 kW

240 V element

IPX4

Splash-proof rated

G3 Kit

Included as standard

3-year

Element warranty

⚠ G3 Competent Person Required
Unvented hot water systems must be installed and commissioned by a G3 accredited competent person in accordance with Building Regulations Approved Document G3 (England & Wales) or equivalent Scottish / Northern Irish regulations. All electrical connections must be made by a qualified electrician in line with current IET Wiring Regulations. The Benchmark commissioning checklist must be completed and left with the householder.

ℹ Direct electrically heated — no boiler required
The SEV50 is heated entirely by its 3 kW electric element. There is no boiler coil — this is an ideal solution for all-electric properties, flats without gas supply, or Economy 7 installations. The complete G3 expansion kit is included; no separate unvented components need to be sourced.

KEY FEATURES

Titanium-Healthy Glass-Lined Vessel

The inner tank is finished with Ferroli's titanium-healthy blue silicone glass lining, which inhibits limescale build-up, improves energy efficiency, and extends vessel lifespan compared to bare-steel alternatives. The stainless steel heating element is independently warranted for 3 years, providing peace of mind in both soft and hard water areas.

Complete G3 Expansion Kit Included

Supplied as a fully compliant G3 package — the expansion kit, safety controls, and all required unvented components ship with the unit. No additional unvented kit purchase is required, making this a cost-effective and convenient specification for G3 installers working on new or replacement installations.

IPX4 — Bathroom and Wet-Area Rated

IPX4 splash-proof protection makes the SEV50 suitable for installation in bathrooms, shower rooms, and utility areas subject to water spray, compliant with current IET Wiring Regulations zone requirements. The shockproof ABS outer casing protects internal components in demanding installation environments.

Adjustable Temperature — Easy Maintenance

A user-adjustable thermostat allows output temperature to be set to preference. The vertical wall-mounted design allows easy access for periodic servicing without the need for major disassembly. A built-in electrical cable is pre-fitted for straightforward connection to a dedicated fused spur.

Mains-Pressure Hot Water Delivery

As an unvented cylinder connected directly to the cold-water mains, the SEV50 delivers hot water at mains pressure — no loft tank, no pump required. This ensures consistent flow and pressure to all hot outlets in the property, and is compatible with thermostatic shower valves that require balanced hot and cold pressures.

Ferroli Quality — Founded 1955

Ferroli has designed and manufactured water heating appliances since 1955 in Verona, Italy, and now operates in 14 countries. The UK operation is based in Burton-upon-Trent, Staffordshire. Ferroli's water heater range covers instantaneous and storage units from 5 L to large commercial capacities, with a strong focus on build quality and long service life.

TECHNICAL SPECIFICATIONS

Parameter	SEV50 Specification
MPN / Product code	SEV50 / GRDR4W0A
Nominal capacity	50 litres
Actual capacity	47.5 litres
Power	3 kW @ 240 V AC
Inner vessel lining	Titanium-healthy blue silicone glass-lined
Heating element material	Stainless steel
Element warranty	3 years
IP rating	IPX4
Casing material	Shockproof ABS
Dimensions H × W × D	578 × 450 × 480 mm
Orientation	Vertical, wall-mounted
G3 expansion kit included	Yes — supplied as standard
Built-in electrical cable	Yes
Temperature adjustment	Yes — user-adjustable thermostat
Heating type	Direct electric — no boiler connection

FREQUENTLY ASKED QUESTIONS

Does the SEV50 come with the unvented expansion kit, or do I need to buy it separately?

The G3 expansion kit is included as standard with the SEV50 (GRDR4W0A). It ships complete with the required unvented safety components — you do not need to purchase a separate unvented kit. This is reflected in the product name: c/w G3 Expansion Kit. Confirm with your wholesaler at the point of order that the kit is included in the box.

Can the SEV50 be used on an Economy 7 tariff?

Yes — the SEV50 is well suited to Economy 7 and other off-peak electricity tariffs. The immersion heater can be wired to a time switch set to operate during the overnight cheap-rate period, heating the 47.5-litre store ready for daytime use. A boost facility can also be provided on a separate circuit for top-up heating during the day if required. Wiring must be carried out by a qualified electrician.

Can the SEV50 be installed in a bathroom?

Yes — the IPX4 splash-proof rating means the SEV50 is rated for installation in areas subject to water spray, including bathrooms, subject to compliance with the IET Wiring Regulations zone requirements for electrical equipment in bathrooms (BS 7671). Your electrician will confirm which zone the intended location falls within and whether additional protection (e.g. RCD) is required.

What is the actual usable capacity — is it really 50 litres?

The nominal capacity is 50 litres; the confirmed actual water capacity is 47.5 litres. The difference accounts for the volume occupied by the heating element, insulation inset, and internal components. This is standard across the industry — always use the actual capacity figure when calculating hot water demand.

What is the warranty on the SEV50?

The stainless steel heating element carries a 3-year warranty. The wider appliance warranty terms should be confirmed with Ferroli UK at the point of purchase or registration — contact Ferroli UK on 0330 205 0005 or via technical@ferroli.com. Warranty claims require evidence of correct installation by a competent person and a completed commissioning record.

Special Offers – Heating & Energy Deals You Don’t Want to Miss