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House Pavlou


This house is located in the Waterkloof, Pretoria area within a high-income subboard. This is a four (4) bedroom house with a domestic outbuilding.




Previously installed were two (2) 150L Electric Geysers to accommodate the hot water distribution for the bathrooms and one (1) 100L Electric Geyser for the kitchen and domestic outbuilding.


The customer needed a more efficient Hot Water Generation Solution and an opportunity to save on the electric demand required to heat the water.


SOLASMART designed a hot water generation and storage solution based on the hot water distribution requirements and to maximize the savings opportunity. The current electrical geysers supplying hot water to the bathrooms were replaced with a centralized Thermal Hot Water System, generating FREE energy from the sun.

A Forced Circulation Solution was proposed that consisted of the following:

# Generation - is provided by three (3) Collectors with a total aperture of 6.3 square meters and as backup an Electrical Element with a load of 4kW.

# Storage - is a 500L Vertical Tank with two (2) Heat Exchangers/Coils. 

The lower Heat Exchanger/Coil is the primary source of hot water generation and the upper Heat Exchanger/Coil is available as a secondary hot water generation source supplied by a Heat Pump. There is an option to utilise the second Heat Exchanger/Coil to heat towel rails in the bathrooms or be used for underfloor heating.

# Operation - is based on a Closed Circuit incorporating a Circulation Station, the Collectors and the Heat Exchanger/Coil within the Storage Tank. The system is controlled by Differential Temperature Controller that continuously checks the difference in temperature between the tank and the collectors.

When the difference in temperature between the sensor located at the top of the collectors and the sensor located at the bottom in the storage tank is greater than the ‘Differential Temperature - the difference in temperature measured between the temperature of chilled water at the return point and the temperature of chilled water at the delivery point', the circulator pump located at the Circulation Station starts up and the FREE energy generated in the collectors is being exchanged through the Heat Exchanger/Coil to heat the water in the tank. The circulator pump functions only for the period of time that the above situation exists and only then the water in the storage tank is being heated.

This solution not only resulted in generating FREE energy to heat the water but also manages Energy Savings for the customer with an estimated payback less than three (3) Years.

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