Akva Geo Accumulator Tanks

Akvaterm AkvaGeo accumulator tanks are specifically designed for connection to heat pumps and provide a variety of benefits to the system:

Like the solar tanks the Akvaterm AkvaGeo accumulator tanks have a stratification baffle plate about a third of the way down the tank. This can be optionally upgraded to an insulated baffle to further improve performance but the added benefit is not huge as it is very good already. Once the water above the baffle has been heated to a high temperature by the heat pump (50ºC-60ºC) it then shifts to heating the bottom two thirds of the tank to a much lower temperature suitable for underfloor heating (around 40ºC).

Heat pumps run very efficiently when producing water at relatively low flow temperatures of, say, 35ºC-40ºC. Here the Coefficient Of Production, C.O.P. will be high, perhaps around 3:1 on average, so for every kW of electricity you put in you get 3kW of heat out. The problem comes because the heat pump also needs to provide your domestic hot water for bathing and washing. Here the heat pump needs to provide a flow temperature of around 50ºC-60ºC and at these temperatures the heat pump does not run efficiently, so the C.O.P. is much low er. To minimise the time that the pump is running at a low C.O.P. you can install two water tanks, one for your domestic hot water that is help at a high temperature, another to drive the underfloor heating at a much lower temperature. The Akvaterm Akva Geo combines all this in one tank and to top it off the Akva Geo accumulator tank can also come as a fully equipped solar or solar plus tank so you get the best of both worlds.

The Akvageo thermal stores also have a larger than normal lower domestic hot water coil. This is to ensure that the incoming mains water picks up as much heat from the bottom of the tank which holds the 'cheaper' heat produced at a high C.O.P.

Here we have AkvaGeo Solar accumulator tanks / heat stores. These have a lower solar coil in addition to the two domestic hot water coils.

Here are Akvaterm AkvaGeo Solar Plus accumulator tanks / heat stores. These tanks have two solar coils, one at the top, one at the bottom. This has the advantage of making the tank response time more like a tank a third of the volume, giving you usable domestic hot water in less time, whilst still providing a decent volume for heat storage. The AkvaGeo Solar Plus tanks also have two domestic hot water coils like the others in the AkvaGeo range with the lower coil of increased size to help to pick up as much heat as possible from the bottom of the tank.