Heat Pumps

Scientific tests have shown that where in a normal electric geyser one unit of electrical energy produces one unit of heat energy, with a heat pump, one unit of electrical energy produces between 2.5 and 3.5 units of heat energy.

Heat Pump Diagram

As ambient temperature increases so does the efficiency. But even at the lowest temperatures a heat pump is more efficient than an electric geyser.


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We correctly install the heat pump ensuring optimal heat pump operation. Many heat pumps are not installed correctly and fail to yield expected results.


How a Heat Pump Works

Heat pump water heaters use electricity to move heat from one place to another instead of generating heat directly. To move the heat, a heat pump works like a refrigerator in reverse. While a refrigerator pulls heat from inside a box and dumps it into the surrounding room, a heat pump water heater pulls heat from the surrounding air and dumps it—at a higher temperature—into a tank to heat water.

Heat Pump Electricity Consumption

A heat pump offers you a way to use electricity to heat water efficiently. A small amount of electricity is required to operate the compressor. The quantity of heat delivered to the water tank will be 3 to 5 times the quantity of electricity used.

Where a geyser uses three units of electrical energy to produce three units of heat energy, a heat pump converts just one unit of electrical energy into three units of heat energy—hence a saving of 67%.

What is the COP Ratio?

The coefficient of performance or COP of a heat pump is a ratio of heating provided to electrical energy consumed. Higher COPs equate to lower operating costs. Heat pumps must pass the 2.8 COP efficiency performance test conducted by the South African Bureau of Standards.

Difference between a Heat Pump and Solar Geyser?

Heat pumps and solar water heaters are different technologies that offer similar benefits. Both are designed to maximize your environmental resources and reduce your energy bills.

Solar Geyser Heat Pump
UNIT COST Higher capital upfront investment and installation costs Lower capital upfront investment and installation costs.
ELECTRICAL Works optimally when the sun shines, no electricty required. If it is overcast, the electrical back-up element kicks in to compensate for the lack of solar energy. Completely dependent on electricity to heat the water. Uses more electricity than a solar geyser due to its dependence on electricity however this usage per hour is low. A 5Kw heat pump uses 1Kw per hour, whereas a conventional 200 litre electrical geyser uses 200Kw per hour.
MAINTENANCE Routine maintenance similar to an electric geyser is needed on a solar water heater, but only on the valves and not on the system itself. Periodic checks are required to check and top-up (if necessary), or replace (depending on the system) the anti-freeze agent. Heat pumps require a lot of maintenance due to the constant moving parts. Maintenance on a heat pump not only requires the skills of a plumber or electrician but also that of an air conditioning technician.
EFFICIENCY Solar water heaters are more ideal for Gauteng winters where we have cold clear sky. Heat pumps are less efficient than a solar system in high radiation and low ambient temperatures.
SAVINGS A solar water heater can save up to 40% on your household’s water heating costs. Achieves 80% of the savings that a solar heated water can provide.
INSTALLATION Requires intricate plumbing. Relatively easy to install.
FITTINGS Requires a non-return valve, an isolating valve and a thermo blending valve. The thermo blending valve requires maintenance. Requires two isolatating valves and a strainer. The strainer must be cleaned periodically, especially on older homes with galvanised pipes.
INSTALLATION POSITION Typically mounted on roof, preferably North facing to achieve best sun coverage, however can be installed anywhere. Must be mounted not more than 10 meters away from the water storage tank. To ensure sufficient savings, the heat pump either needs to face north, east or west.
NOISE LEVEL None.
Can be noisy. Most noise generated after hot water consumption (at night, early in the morning).
WATER QUALITY The quality of water doesn’t influence the system. The Solahart system has a sacrificial magnesium protective anode and double ceramic lined tank prevents corrosion. A Solahart solar water heater also handles the issue of calcium carbonate better, as it can be easily scooped out during routine maintenance. Heat pump manufacturers do not warrant their systems if the hardness of the water is higher than a certain level. The calcium carbonate in the water solidifies and falls to the bottom of the tank. After a while, the sediment starts to block the heat exchanger.
LIFESPAN The lifespan of a solar geyser is 15+ years. The lifecycle of a Solahart solar water heater is 20+ years, the oldest system is 30 years old and still running. The lifespan of a heat pump is 5 to 10 years.