Solar Water Heating Wellington

Solar Water Heating Wellington

Wellington is an ideal place for solar water heating. If you are an eco-friendly person or you want to spend less on electricity or you have very little power available then solar water heating is the way to go.

There are two kinds of solar collectors, namely, flat plate and evacuated tubes.

There are two types of installations pumped and thermosyphon. Pumped is the most popular in especially when retrofitting an existing house.

What competes with solar water heaters for efficiency and cost? Heat pump water heater. It has a similar efficiency at a lower cost. Contact us for more info.

The photo on right shows one of Wellington’s Largest solar water systems.

Solar array in newtown wellington
A large solar array we installed in Newtown Wellington

Pumped vs Thermosyphon

From a plumbing perspective, there are pumped and thermosyphon (or unpumped). Thermosyphon installations the tank is installed on the roof top with the solar panels. Often owners don’t want a tank on their roof due to the weight of the tank on the roof. With a pumped installation the tank is usually inside the house or it can be in the roof space.

Pumped system consists of a circulation pump along with a controller installed to the geyser to regulate water to the collector and then water returns once it is heated.

Most solar water heaters in New Zealand are pumped. If a building is designed for solar water heater, the tank and collector can be installed on the top. Ensure you are not likely to get freezing conditions as thermosyphon systems suffer if the pipes freeze.

Flat Plate vs Evacuated Tube
Flat plate and evacuated tube are types of solar collectors. Tube collectors have the advantage of having a vacuum, which makes it harder to get condensation and mildew on the inside the glass, which is what the flat plate collectors suffer from. Freezing is also an issue for flat plate water-filled collectors. Freezing is overcome with a glycol filled closed-loop system or a controller that has a feature to eliminate the problem by starting the pump briefly to get the water moving slightly to stop it from freezing or a drain back system. Evacuated tubes usually generate slightly more energy than flat plate collectors but are more prone to damage from hailstones and other solid objects.

EECA Solar Installer

EECA or Energy Efficiency and Conservation Authority (Te Tari Tiaki Pūngao) is a government agency which supports renewable energy and helps in improving energy efficiency in New Zealand.

EECA believes in efficient transportation, productive business, energy efficient homes, and more.

We are an EECA approved solar installer based in Wellington. We offer solar panel installation services in Wellington and suburbs such as Miramar, Upper Hutt, Lower Hutt, Whitby, Khandallah, Porirua, and more.

Solar water heating wellington


We repair and replace solar collectors, solar pumps, controllers, diagnose faults, replace insulation and repair frost damage and leaks. We repair flashings and improve energy efficiency. We cover all areas in Wellington including Island Bay, Johnsonville, Karori, Khandallah, Lower Hutt, Lyall Bay, Miramar, Porirua, Pukerua Bay, Seatoun, Tawa and Upper Hutt.

Read our Solar Water Heating FAQs. Contact us for solar panel installation, repair and maintenance services in Wellington. We are available for emergency services on 24 hours basis.