Standard Tanks
Oval Tanks

Solar and Solar Plus Tanks

Akvasan Tanks
Geo Tanks
Smart Tanks
Farm Tanks


Heating Systems
Akvaterm Solar and Solar Plus Accumulator Tank



Akvaterm Solar

The AKVAir Solar is available from 300-2000 litres and is 3 bar pressure rated. The tank has 3 coils, one for solar input and two for domestic hot water (DHW).

The coils are permanently fitted and not removable as in the 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.

Akvaterm Solar Plus
The AKVAir Solar Plus is available from 300-4000 litres and is 3 bar pressure rated. The tank has 4 coils, two for solar input and two for domestic hot water (DHW) and is divided by a baffle plate, approximately 60% below and 40% above the baffle. Each section contains one solar and one DHW coil and all coils are positioned vertically.

The coils are permanently fitted and are not removable as in the AKVA, AKVASAN and AKVANTTI tanks.

The solar coils are for connection to the solar array via a diverting valve to divert flow through top and bottom coil in series or through the lower coil only according to tank temperatures. The two DHW coils are for connection in series. A thermostatic mixing valve combination set (Oras 4200) is supplied with the Solar Plus models for regulating flow temperature to DHW.

An extra thermostatic mixing valve can be installed between the lower and upper DHW coils if desired to reduce flow through the top coil. This is not included in the Solar Plus price..

Both Akvarterm Solar and Solar Plus
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.

Radiator circuits are normally connected flow from the top of the tank and return to mid point. Underfloor heating circuits can be connected flow from the mid point, return to the bottom. Heating flow temperature can be controlled using a 3 way blending valve and regulator such as the Thermomatic K.

Systems incorporating both radiator and underfloor heating can be connected with flow from both the top and the mid point using a 4 way bi-valent blending valve controlled by a Thermomatic K or similar. This arrangement makes use of heat energy from the mid point of the tank when available.

Akvaterm’s 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.

Principle connection diagrams

AKVA SOLAR PLUS with solar collectors

AKVA SOLAR with solar collectors and a fireplace

AKVA SOLAR PLUS with solar collectors and a wood-fired boiler

AKVA SOLAR PLUS with solar collectors and an electric heater



AKVA Solar
AKVA Solar Plus


COUPLINGS
1. 1 1/4” Accumulator coupling
2. 2 " Electric heater coupling
3. 1 " Drain coupling
4. 1 " Pressure relief / Air bleeder
5. 3/4 " Thermostat coupling
T. 10 mm inner diameter coupling (no throughconnection) Sensor and measurement pocket


COILS
A. Ø22 Household water preheating, in
B. Ø22 Household water preheating, out
C. Ø22 Household water, in
D. Ø22 Household water, out
E. Ø18 Solar, in (PLUS)
F. Ø18 Solar, out (PLUS)
G. Ø18 Solar, in
H. Ø18 Solar, out

MODEL

Diameter
Height
Coils

RESISTOR
COUPLINGS

AKVA Solar 300 mini
810mm
2100mm
DHW + Solar Coil
2
AKVA Solar 300
810mm
2100mm
2 x DHW + Solar Coil
2
AKVA Solar 500
900mm
2100mm
2 x DHW + Solar Coil
2
AKVA Solar 750
1050mm
2100mm
2 x DHW + Solar Coil
2
AKVA Solar 1000
1150mm
2150mm
2 x DHW + Solar Coil
2
AKVA Solar 1200
1250mm
2200mm
2 x DHW + Solar Coil
2
AKVA Solar 1500
1350mm
2200mm
2 x DHW + Solar Coil
2
AKVA Solar 2000
1500mm
2250mm
2 x DHW + Solar Coil
3
AKVA Solar 2500
1500mm
2250mm
2 x DHW + Solar Coil
3
AKVA Solar 3000
1600mm
2300mm
2 x DHW + Solar Coil
3
AKVA Solar 4000
1800mm
2450mm
2 x DHW + Solar Coil
4
AKVA Solar 5000
20000mm
2500mm
2 x DHW + Solar Coil
4





 
.
- Structural pressure 3.0, 4.0 or 6.0 Bar.
- Solar Coil = 12m 18mm finned copper for 750l and above 6m 18mm finned copper up to 750l
- D = Domestic hot water or DHW preheat coil 9.4m 22 mm finned copper Thickness of the polyurethane insulation is 150mm up to and including 2000l and 100mm above 2000l capacity

- LK60 and larger coils are installed through hatch.
- AKVA SOLAR PLUS is equipped with: Extra solar coil 6 m (Ø18mm finned copper), ESBE VTD322 and Oras 4200 Themostatic Valve combination for DHW..



   
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