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OSO Mini - RM

  - The ultimate in simplicity for undersink heaters

The Mini is a 5 liter point of use water heater, with an impressive 6 minute recovery time. The small size makes the Mini ideal for under sink fitting in office buildings etc. where the central hot water supply is located at a distance. The Mini can be installed both vertically and horizontally.

The Mini will be most efficient when fitted horizontally. Wall mounting bracket is provided with the cylinder. The Mini requires no expansion vessel, although an expansion relief valve for connection to a waste pipe is supplied. Domestic water expansion is accommodated safely and within the cylinder and associated pipework. No check valve should be fitted within 2 meters of the Mini, to avoid the need for an expansion vessel. An electric cable is supplied factory fitted to the cylinder for connection to the mains supply.


Key advantages:

  • Ideal for office buildings etc., where central heating is located at a distance
  • Can be installed both horizontally and vertically, no expansion vessel required
  • 6 minute heat-up time from cold water to 60°C
  • 10 year warranty on the stainless steel inner cylinder
Delta Agri - DA
Wallsmart - W
Technical Specifications
Quick Facts
Choose volume

Mini is suitable as a point of use water heater, ideal for under sink fitting in office buildings etc.



Prod. nr. Product description Capacity Hot water - 40°C Hot Water / hour - 40°C Heat-up Time - 15 - 75°C: Heat loss - 24 hours Dia x H mm. Weight
8,010,104 Mini RM 5 - 3 kW/1x230V 0,5 pers. 11 l. 85 l./hr. 0,15 hrs. - ø200x430 7
Product Data Sheet
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Direct Electric Unit Type
Product Mini RM 5
Product No. OSO no. 8,010,174
Product Capacity Persons 0,5
Product Segment   Domestic
Weight - Net kg 7
Height - Max mm. 430
Diameter mm. 200
Volume - Actual ltr. 6.0
Usable hot water draw off at 40°C (ltr) ltr. 11
Hot Water / hour at 40°C (ltr) ltr. 85
Heat Up Time - 15°C - max Temp. hours 0.15
Standing Heat Loss - 24 hours kWh/24 hours -
Dimensions - Cardboard Box LxWxH mm. 225x450x235
Volume - Cardboard Box 0.06
Inner Cylinder Stainless Steel Ferritic
Electric Element(s) Stainless Steel Incoloy 825
Electric Box and Lid(s) Plastic Steel
Insulation PUR Mineral Wool
Outer Casing Steel Epoxy Coated
Energy Source
Type - Primary   Electric
Immersion Heater - Capacity kW 3.0
Immersion Heater - Phase Phase 1
Immersion Heater - Voltage Volt 230
Thermostat Type   Surface
Working Thermostat - Temperature Range °C 40-70
Working Thermostat - Set Temperature °C 70
Electrical Installation   Regulations
IP Classification   IP 21
Cold Feed / Hot Water Draw Off Location Side
Cold Feed / Hot Water Draw Off Compression 15mm
Safety Valve (Drain Connection) " (inches) 3/8 - Female
Safety Valve (Overflow Connection) " (inches) 3/4 - Female
P&T Valve " (inches) -
Secondary Return / Hot Water w/o mixing " (inches) -
Immersion Heater(s) " (inches) 1
Safety Valve - Opening Pressure +/- 5 % Bar 9
P&T Valve - Opening Pressure/Temp. Bar/°C -
Safety Thermostat - Cut-out Temp. °C 85
Inner Cylinder - Design Pressure /Temp. Bar/°C 10/99
Certifications / Approvals
Product Certifications Certificates CE / NEMKO / KIWA / WRAS
Manufacturing Plant Approvals Standards ISO 9001:2008 / ISO 14001:2008 / OHSAS 18001
Environmental Declaration 100 % Recyclable / >60 % Recycled Materials / ODP of 0 / GWP of 1
Warranty - Water Quality EN 98/83EC
Water - Chloride Content Max - Cl ppm 250
Water - Sulphate Content Max - So4 ppm 250
Water - Chloride/Sulphate Content Max ppm 250
Warranty Period - Inner Cylinder / Parts Years 10 / 2