The Ferroli MINI5 is an instantaneous (tankless) electric water heater providing hot water on demand at the point of use — with zero standby heat loss and no stored water to maintain. Rated at 5 kW at 220–240 V, it is compact enough to fit in the tightest under-sink spaces at just 197 × 210 × 117 mm and 1.5 kg. Ideal for cloakrooms, office washbasins, secondary sinks, and any location where a storage cylinder is impractical, the MINI5 ships with a built-in electrical cable and carries a 2-year warranty. No G3 certification is required for installation.
No tank
Zero standby loss
2 l/min
Min. flow to activate
ℹ No G3 accreditation required
The MINI5 is an instantaneous water heater — it is not an unvented storage cylinder and does not require G3 competency for installation. Plumbing connections are simple ½" BSP. Electrical connection must be made by a qualified electrician to a dedicated fused spur rated for a 5 kW load, in accordance with IET Wiring Regulations.
ℹ Understanding instantaneous output temperature
With instantaneous heaters, outlet temperature depends on cold inlet temperature and flow rate. At 5 kW with a 2 l/min flow rate and 10 °C incoming cold water, the MINI5 can deliver water at approximately 46 °C — ideal for hand washing. Higher flow rates reduce the temperature rise. This unit is designed for single-point hand-washing use, not showers or bath-filling.
KEY FEATURES
Instantaneous — Zero Standby Heat Loss
The MINI5 heats water only when the tap is opened — electricity is consumed solely on demand, eliminating the standby losses associated with storage heaters. This makes it the most energy-efficient option for low-frequency or single-outlet use, particularly cloakrooms and secondary sinks used intermittently throughout the day.
Ultra-Compact — Fits the Tightest Spaces
At just 197 × 210 × 117 mm and weighing only 1.5 kg, the MINI5 is among the smallest instantaneous water heaters available. It mounts easily under a sink, inside a slim vanity unit, or in a cupboard — anywhere with access to a cold-water supply and a 5 kW electrical circuit.
Built-in Cable — Simple Installation
The MINI5 ships with a pre-fitted electrical cable ready for connection to a dedicated fused spur. Water connections are ½" male BSP, compatible with standard UK plumbing. The unit is rust-free with a shockproof casing, requiring minimal installation effort and long-term maintenance.
Adjustable Temperature Control
An adjustable thermostat allows the user to set outlet temperature to preference. The unit operates across a supply pressure range of 0.8–6 bar and requires a minimum flow rate of 2 litres per minute to activate — compatible with standard UK mains and boosted low-pressure supplies above the minimum threshold.
Ideal Where Storage Is Impractical
The MINI5 is particularly well suited to: cloakroom washbasins added to an existing property; offices and commercial premises with hand-wash sinks remote from the main hot water system; outbuildings, garden rooms, and annexes; and accessible toilet refits where a compliant hot water supply is needed without pipework runs from a distant cylinder.
Ferroli Quality — 2-Year Warranty
Manufactured to Ferroli's quality standards, established since 1955, the MINI5 carries a 2-year warranty. The rust-free, shockproof construction is designed for longevity in confined under-sink environments. Ferroli UK technical support is available on 0330 205 0005.
TECHNICAL SPECIFICATIONS
| Parameter |
MINI5 Specification |
| Type |
Instantaneous (tankless) — no storage vessel |
| Power |
5 kW @ 220–240 V / 50–60 Hz AC |
| Dimensions H × W × D |
197 × 210 × 117 mm |
| Weight |
1.5 kg |
| Water connections |
½" male BSP |
| Min. water flow rate to activate |
2 litres/min |
| Operating pressure min/max |
0.8 bar / 6 bar |
| Built-in electrical cable |
Yes (plug not included) |
| Temperature adjustment |
Yes — adjustable thermostat |
| Casing |
Rust-free / shockproof |
| G3 accreditation required |
No |
| Warranty |
2 years |
FREQUENTLY ASKED QUESTIONS
Does the MINI5 need a G3 competent installer?
No — the MINI5 is an instantaneous heater, not an unvented storage cylinder, and does not fall under the G3 Building Regulations requirements. A standard plumber can connect the water supply. However, the electrical connection must be made by a qualified electrician to a dedicated fused spur circuit rated for 5 kW, in line with current IET Wiring Regulations.
Will the MINI5 work on a low-pressure supply?
The MINI5 requires a minimum supply pressure of 0.8 bar and a minimum flow rate of 2 litres per minute to activate the heating element. Supplies above these thresholds — including boosted gravity-fed systems — are compatible. Below 0.8 bar, the unit may not activate. If your supply pressure is uncertain, confirm it before installing.
Can the MINI5 supply a shower?
No — at 5 kW, the MINI5 is designed for single-point hand-washing use only. A shower typically requires 8–10 kW minimum for an electric instantaneous supply. The MINI5's output temperature drops significantly at higher flow rates; it is not suitable for shower or bath applications. For shower use, please see dedicated electric shower products rated at 8 kW or above.
What circuit does the MINI5 require?
The MINI5 draws 5 kW at 220–240 V, equating to approximately 21–23 A. It requires a dedicated fused spur on a circuit rated for this load — typically protected by a 25 A or 32 A MCB depending on cable sizing and run length. Your electrician will confirm the correct circuit protection. The unit ships with a built-in cable; a plug is not included.
