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OSO Optima Coil - EPC

  - The ideal choice for heat pumps - space heating and hot water

The Optima Coil’s unique construction (pat.) provides optimal working conditions for heat pumps up to 12kW without the possibility of prioritizing domestic hot water (DHW) production. Integrated buffer tank functions as energy storage for space heating requirements. The Optima Coil provides consistent space heating temperature while increasing DHW production significantly.

The unique tank-in-tank construction provides maximum COP (Coefficient of Performance) for heat pumps up to 12 kW. The large buffer tank (> 100 l.) is suitable for space heating such as under-floor heating or wall mounted radiators. The heating coil in the buffer tank pre-heats DHW before shifting it to the DHW tank in the top. In addition, the water in the buffer tank transfers heat to the domestic hot water tank. Both features reduces return temperature to the heat pump and maximizes COP like no other solution on the market. There is no heat transfer from the DHW to the buffer tank due to carefully designed features. Should the heat pump fail, there is full electric back up through the 9 kW electric heater.
 

In the DHW tank, the 3kW electric heater increases the water temperature to 70°C. Separate ½” sensor pockets for precise control from the energy source is factory fitted. Low heat loss is provided by OSO ECO Foam, with impressive key figures for GWP of 1 (Global Warming Potential) and ODP of 1 (Ozone Depletion Potential.)

Key advantages:

  • The ultimate tank-in-tank unit for heat pumps up to 12kW, providing both DHW & space heating
  • Unsurpassed energy efficiency with minimum heat loss and maximized COP
  • Impressive DHW production compared to traditional tank-in-tank units
  • 10 year warranty on the stainless steel inner cylinder & OSO ECO Foam insulation
Ecoline Twin Coil - RI TC
Optima Coil Inside - EPCI
Technical Specifications
Quick Facts
Choose volume

Optima Coil is available in 2 volumes, suitable for the no. of people designated in the table below. The table is based on experience from average hot water usage in a normal household. Hotwater capacity is calculated by instant tapping at 40°C. at 40°C a normal shower uses approx. 60 l., bathtubs 180 l. and bubblebaths 400 l. Capacity is also dependant upon the heat source's size and performance.

 

 

 
Prod. nr. Product description Capacity Hot water - 40°C Heat-up Time Heat loss - 24 hours Dia x H mm. Weight
8,000,266 Optima Coil EPC 300 - 3+9 kW 5,0 pers. Heat Source Heat Source 2,5 kWh ø580x1670 70 kg
8,000,267 Optima Coil EPC 360 - 3+15 kW 6,0 pers. Heat Source Heat Source 2,9 kWh ø580x1990 85 kg
8,000,268 Optima Coil EPC 300 HT - 3+15 kW 5,0 pers. Heat Source Heat Source 2,2 kWh ø580x1670 70 kg
Product Data Sheet
  - click to expand   - click to collapse
 
Indirect Unit Type Type Type
Product Optima Coil EPC 300 EPC 360 EPC HT 300
Product No. OSO no. 8,000,266 8,000,267 8,000,258
Product Capacity Persons 5 6 5
Product Segment   Domestic Domestic Domestic
Product
Weight - Net kg 70 85 70
Height - Max mm. 1760 1990 1760
Diameter mm. 580 580 580
Volume - Actual ltr. 170 210 180
Usable hot water draw off at 40°C (ltr) ltr. 375 490 310
Hot Water / hour at 40°C (ltr) ltr. Heat Source Heat Source Heat Source
Heat Up Time - 15°C - max Temp. hours Heat Source Heat Source Heat Source
Standing Heat Loss - 24 hours kWh/24 hours 2.50 2.90 2.20
Dimensions - Cardboard Box LxWxH mm. 595x625x1750 595x625x2000 595x625x1750
Volume - Cardboard Box 0.64 0.74 0.64
Materials
Inner Cylinder Stainless Steel Duplex Duplex Duplex
Coil(s) Stainless Steel Duplex Duplex Duplex
Electric Element(s) Stainless Steel Incoloy 825 Incoloy 825 Incoloy 825
Electric Box and Lid(s) Plastic V0 Plastic V0 Plastic V0 Plastic
Insulation PUR ECO Foam ECO Foam ECO Foam
Outer Casing Steel Epoxy Coated Epoxy Coated Epoxy Coated
Energy Source   Suggested Suggested Suggested
Type - Primary   Heat Pump Heat Pump Heat Pump
Type - Secondary   - - -
Temperature - Primary / Lower   Low Temp. Low Temp. Low Temp.
Temperature - Secondary / Upper   - - -
Heating Coil(s)
Surface area - Primary / Lower 0.25 0.25 0.8 + 0.25
Surface area - Secondary / Upper 0.80 0.80 -
Recommended Flow Rate ltr./min. Heat Pump Heat Pump Heat Pump
Heat Source Buffer Volume ltr. 120 140 120
Electric
Immersion Heater Booster - Capacity kW 3.0 3.0 3.0
Immersion Heater Backup - Capacity kW 9.0 15.0 15.0
Immersion Heater - Phase Phase 1/3 1/3 1/3
Immersion Heater - Voltage Volt 230/400 230/400 230/400
Thermostat Type   Surface Surface Surface
Upper Working Thermostat - Temp. Range °C 60-90 60-90 60-90
Upper Working Thermostat - Set Temp. °C 75 75 75
Lower Working Thermostat - Temp. Range °C 30-60 30-60 30-60
Lower Working Thermostat - Set Temp. °C 45 45 45
Electrical Installation   Regulations Regulations Regulations
IP Classification   IP 21 IP 21 IP 21
Connections
Cold Feed / Hot Water Draw Off Location Top Top Top
Cold Feed / Hot Water Draw Off Compression 15mm 15mm 15mm
Safety Valve (Drain Connection) " (inches) 3/8 - Female 3/8 - Female 3/8 - Female
Safety Valve (Overflow Connection) " (inches) 3/4 - Female 3/4 - Female 3/4 - Female
T&P Valve (Overflow Connection) Compression - - -
Secondary Return / Hot Water w/o mixing " (inches) 3/4 - Female 3/4 - Female 3/4 - Female
Immersion Heater(s) " (inches) 5/4 5/4 5/4
Primary Coil Flow / Return " (inches) 3/4 - Female 3/4 - Female 3/4 - Female
Buffer Volume Flow / Return " (inches) 4x1 - Female 4x1 - Female 4x1 - Female
Sensor Connection w/ PG nipple mm. 8mm 8mm 8mm
Safety
Safety Valve - Opening Pressure +/- 5 % Bar 9/3 9/3 9/3
T&P Valve - Opening Pressure/Temp. Bar/°C - - -
Safety Thermostat - Cut-out Temp. °C 98/75 98/75 98/75
Inner Cylinder - Design Pressure /Temp. Bar/°C 10/99 10/99 10/99
Coil(s) - Design Pressure Bar 10 10 10
Certifications / Approvals
Product Certifications Certificates CE / NEMKO / KIWA / WRAS
Manufacturing Plant Approvals Standards ISO 9001:2008 / ISO 14001:2008 / OHSAS 18001
Environment
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 250 250 250
Water - Sulphate Content Max - So4 ppm 250 250 250
Water - Chloride/Sulphate Content Max ppm 250 250 250
Warranty Period - Inner Cylinder / Parts Years 10 / 2 10 / 2 10 / 2