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 AKVA Solar Thermal Accumulator Tank

The AKVA Solar is available from 300-5000 litres and is 3 bar pressure rated as standard. The tank has 3 coils: one for solar input and two for domestic hot water (DHW).

 

The coils are factory fitted and are not removable (unlike those found in AKVA, AKVASAN and AKVANTTI tanks).

 

The tank is divided by a baffle plate with approximately 60% below and 40% above the baffle.

The solar coil and the pre-heat DHW coils are positioned vertically in the lower part of the tank. The solar coil is connected for downwards flow and the domestic water for upwards flow.

 

The secondary DHW coil is located above the baffle plate, for connection in series from the lower coil. A thermostatic mixing valve can be installed between the lower and upper DHW coils if desired to reduce flow through the top coil. A thermostatic mixing valve is required in all cases after the top DHW coil

Automatic boilers, whether gas, oil, wood chip or wood pellet, are connected across the top and mid point of the tank. Batch fed boilers and stoves should be connected top and bottom to provide the full buffer volume of the tank.

 

Heating circuits are normally supplied from the top and mid-point connections, returning to the bottom of the tank. Flow temperature to heating can be regulated by a 3 port blending valve or, where flow is taken from both the top and mid-point connections, a 4 port bivalent valve, using a Thermomatic CC or EC Home controller.

Akvatermís Solar and Solar Plus range of tanks are designed to make solar energy available to both heating and DHW. If the top of the tank is not connected to an automatic boiler capable of meeting the heating demand, consideration must be given to the control of the heating to prevent depletion of the heat reserve for DHW.

Arrangement of standard connections and coils

                      

Model

Capacity
(l)

Pressure rating

Diameter
(mm)

Height
(mm)

Coils*

Insulation
(mm)
Energy Class

AKVA Solar 300

300

3 bar

810

2100

1x Solar
2x DHW

150

AKVA Solar 500

500

3 bar

900

2100

1x Solar
2x DHW

150

AKVA Solar 750

750

3 bar

1050

2100

1x Solar
2x DHW

150

AKVA Solar 1000

1000

3 bar

1150

2150

1x Solar
2x DHW

150

AKVA Solar 1500

1500 3 bar 1350 2200 1x Solar
2x DHW
150

AKVA Solar 2000

2000 3 bar 1500 2250 1x Solar
2x DHW
150

AKVA Solar 2500

2500 3 bar 1500 2250 1x Solar
2x DHW
100 -

AKVA Solar 3000

3000 3 bar 1600 2300 1x Solar
2x DHW
100 -

AKVA Solar 4000

4000 3 bar 1800 2450 1x Solar
2x DHW
100 -

AKVA Solar 5000

5000 3 bar 2000 2500 1x Solar
2x DHW
100 -

*Coils:

Solar = Lower: 18mm finned copper (12.2 metres)
            Upper: 18mm finned copper (6 metres)
DHW =  Domestic hot water coil, 22mm finned copper (9.4 metres)
       

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