150L Heat Pump Water Heater

What Is a Heat Pump Water Heater?

A heat pump water heater works on the same principle as a reverse-cycle air conditioner. A compressor circulates refrigerant through an outdoor unit that extracts heat energy from the surrounding air — even at temperatures as low as 5 degrees. That heat is transferred to the water in an insulated storage tank. The result is 3 to 4 units of heat energy delivered to the water for every 1 unit of electrical energy consumed — known as a Coefficient of Performance (COP) of 3 to 4. By comparison, a conventional electric element geyser operates at a COP of 1. The heat pump is typically 3x more efficient.

System specifications: Tank capacity: 150 litres | Technology: Air-source heat pump | COP (efficiency): 3.0–4.0 | Power supply: 220V single-phase | Backup element: Included for use in extreme cold conditions | Recommended household size: 2 to 4 people.

When to Choose a Heat Pump Over a Solar Geyser

A solar geyser requires north-facing roof space with minimal shading for effective operation. A heat pump does not. Choose a heat pump when your roof is shaded by trees or neighbouring buildings, your property does not have suitable north-facing roof space, you live in a consistently overcast region where solar collector performance would be limited, or you want a hot water solution that is completely independent of sunlight. Heat pumps work effectively at night and on overcast days.

Electricity Savings vs. Electric Geyser

A conventional 150L electric element geyser at R3.50/kWh costs approximately R600–R1,100 per month to run. A heat pump of equivalent capacity, with a COP of 3.5, reduces that electricity cost by approximately 65–72%, saving R400–R800 per month.

Installation Requirements

A heat pump requires a 15-amp or 20-amp dedicated electrical circuit, outdoor placement for the heat-extraction unit with adequate air circulation (minimum 1 metre clearance on all sides), and connection to the household cold-water supply and hot water circuit. A heat pump can be installed on a balcony, courtyard, or against an exterior wall — it does not require roof mounting.

Supply Only

R21,990 is for the unit only. Installation requires a qualified electrician and plumber. Contact PowerVault ZA on +27 83 476 8779 or info@powervaultza.co.za. We are based at 14 Sol Street, Linbro Business Park, Sandton, Johannesburg.

Frequently Asked Questions

Q: Does a heat pump work on cloudy days?
A: Yes. A heat pump extracts heat from ambient air, not from sunlight. It operates effectively on overcast days, at night, and in shaded locations. The only condition that reduces its efficiency is sustained extreme cold below minus 5 degrees.

Q: How much electricity does a heat pump use compared to a normal geyser?
A: A heat pump with a COP of 3.5 uses approximately 65–72% less electricity than a conventional electric element geyser for the same volume of hot water. This typically translates to savings of R400–R800 per month on a 150L household system.

Q: Where does the heat pump unit get installed?
A: The heat pump has an outdoor unit (similar to an air conditioner condenser) that must be placed in an area with good air circulation — a courtyard, balcony, garage exterior wall, or garden. It does not require roof mounting or any direct sunlight exposure.

Q: Is a heat pump louder than a solar geyser?
A: Yes. A heat pump has a compressor and fan that produce a low operational hum — similar in volume to a small air conditioner, typically 45–55 dB at 1 metre.

Q: Does this qualify for the Section 12B tax deduction?
A: Heat pumps for residential water heating may qualify under SARS Section 12B for qualifying installations. Consult a registered tax practitioner for advice specific to your situation.