New hot water solar controller from Resol

The new Deltasol AL E HE is intended for hot water solar systems with electric secondary heating. (Photo: Resol)
The new Deltasol AL E HE is intended for hot water solar systems with electric secondary heating. (Photo: Resol)

The solar specialist Resol has launched a new solar controller for controlling hot water solar thermal systems that use electric secondary heating.

For this purpose, the controller is equipped with a high-power relay that allows an electric heating element with up to 3 kW (230 V) to be directly connected and used for domestic water heating. It features time as well as temperature control.

In addition, the controller provides functions for thermal disinfection and quick heating. Users can enable the latter both on the controller as well as using a remote control. The solar secondary heating suppression and a holiday mode ensure that the heater does not consume electricity unnecessarily.

The controller is designed for application scenarios where the secondary heating requirements are low, so investing in a gas boiler would not be economical. Holiday homes and weekend homes are examples of this.

Electrical secondary heating is also very common in southern Europe in the thermosiphon systems that are used there. A drain-back option, which is also very popular in the south, is included specifically for this market.

In addition, the new controller has a tube collector function as well as a bidirectional PWM interface and an input for a Grundfos Direct Sensor VFD, which enable it to precisely measure heat quantities.

Resol optionally offers the controller as a complete package together with two sensors. Further details on the controller can be found in our 'energy database', which allows you to compare it with other hot water controllers.

Jan Gesthuizen

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