Heatrae Sadia Hotflo 10L 2.2kW Unvented Water Heater

Description

The Heatrae Sadia Hotflo 10L is a compact 2.2kW electric unvented water heater built for small commercial washrooms and kitchenettes where a cold water cistern isn't available. Fed directly from the mains, it delivers mains-pressure hot water to up to two hand basins without the flow restrictions typical of gravity-fed systems.

Its high-grade copper inner container needs no sacrificial anode, cutting out a whole category of routine maintenance, while the externally adjustable thermostat (10–70°C) lets installers tune output temperature to the application on site.

10L

Storage Capacity

2.2kW

Heating Element

6 bar

Rated Pressure

10–70°C

Thermostat Range

16.5kg

Full Weight

2 Yr

Guarantee

Installation Requirement

This unit must be fitted with a Pressure (expansion) Relief Valve on the cold water supply. If the static mains pressure exceeds 4.1 bar (60 psi), a Pressure Reducing Valve and Expansion Vessel are also required — see Heatrae Sadia's Accessory Packs U1/U2/U5. Installation must be carried out by a competent, Gas Safe/WRAS-aware installer in line with Water Supply (Water Fittings) Regulations.

No Cistern Required

Being fully unvented and mains-fed, the Hotflo 10L can be installed anywhere with a mains water connection — no cold water storage cistern or loft space needed, which is what makes it so popular for retrofit washroom upgrades.

Copper Inner Container

The replaceable copper inner container is rated for 6 bar working pressure and type-tested to 20 bar, giving long-term corrosion resistance without an anode to inspect or replace.

Externally Adjustable Thermostat

The 10–70°C thermostat is adjustable from outside the casing, so installers and facilities teams can recalibrate output without opening the unit.

IPX4 Splashproof Rating

Rated IPX4 for protection against splashing water, making it suitable for wet commercial environments such as washrooms and catering prep areas.

CFC/HCFC-Free Insulation

Flame-retardant expanded polystyrene insulation with zero ozone depletion potential (ODP zero) supports environmental compliance without sacrificing thermal efficiency.

Factory-Fitted Safety Valve

Supplied complete with a Pressure Relief Valve and a 1-metre 3-core power cable, reducing on-site parts sourcing and speeding up first-fix.

Performance
Storage Capacity	10 litres
Heating Element	2.2kW @ 230/240V
Suitable For	Up to 2 hand basins/sinks
Thermostat Range	10–70°C, externally adjustable
Pressure & Water
Rated Working Pressure	6 bar
Type-Tested To	20 bar
Minimum Supply Pressure	0.8 bar
Temperature/Pressure Relief Valve Setting	90°C / 7 bar
Water Connections	15mm compression, copper tube (no soldered joints)
Construction
Inner Container Material	High-grade copper, replaceable
Insulation	CFC/HCFC-free expanded polystyrene (ODP zero)
Ingress Protection	IPX4
Dimensions (W x H x D)	267 x 500 x 252mm
Weight (Full)	16.5kg
Weight (Empty)	≈6.3kg
Electrical & Supply
Supply Cable	1 metre, 3-core, factory-fitted
Recommended Fusing	13A, via double-pole isolating switch (3mm contact separation)
Compliance
Approvals	Kiwa approved to UK Water Supply Regulations, BEAB, CE marked
EAN	5012496501485
Guarantee	2 years, on-site parts and labour

Do I need a cold water tank to install the Hotflo 10L?

No. As an unvented water heater it runs directly from the mains cold water supply, so no cistern or tank is required — this is one of the main reasons it's chosen for retrofit washroom projects.

How many basins can the Hotflo 10L supply?

The 10 litre model is designed for up to two hand basins or sinks used intermittently, such as a small washroom. For three basins or higher-demand use, the 15L version of the range is the better fit.

What accessories does it come with?

The unit is supplied with a factory-fitted Pressure Relief Valve and a 1 metre power cable. Depending on your mains pressure, you may also need a Thermostatic Blending Valve, Expansion Vessel, or Pressure Reducing Valve — available as Heatrae Sadia Accessory Packs.

Can it be used with a shower?

No. The Hotflo range is designed for tap outlets (standard or mixer) and is not recommended for supplying a shower.

Does the copper inner container need an anode?

No. Copper is corrosion-resistant on its own, so there's no sacrificial anode to inspect or replace — unlike some steel-cylinder alternatives.

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Room Dimensions

Length (in m):

Width (in m):

Height (in m):

Room Type

Living Room

Bedroom

Kitchen

Bathroom

Conservatory

Hallway

Glazing Type

Single Glazed

Double Glazed

Triple Glazed

External Walls

0 Wall

1 Wall

2 Walls

3 Walls

4 Walls

Insulation Level

Poor

Average

Good (New Build)

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