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Hot Water Heat Pumps
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Gree WHIO Inverter
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Manage, maintain, and master your hot water system.

Gree WHIO Inverter

Hot Water Heat Pump

Register your warranty

To ensure your comprehensive Gree manufacturer's warranty is fully locked in, please make sure to register your unit online via the Gree website using the details provided in your handover pack. Keep these installation details handy for your records, or in the unlikely event you need to make a claim:

Installer

Hot Water Shop

Company City

Christchurch

Install Date

Please refer to your invoice.

System Serial No.

Found on the silver rating plate located on the side of your cylinder.

Register your Gree Warranty

Register

Need to make a warranty claim?

Make a claim

Master your system: The Gree+ App

The Gree WHIO features cutting-edge inverter technology, adjusting its compressor speed dynamically to match your hot water demands with incredible precision.

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How to set up the appUser Manual

Gree Smart Connectivity

Manage your system settings directly from your phone.

Dynamic Heating

The inverter scales up power for fast recovery and drops down to a whisper-quiet, ultra-efficient low draw when maintaining temperatures.

Scheduling

Use the timer controls to align your heating window with your cheapest electricity rates.

Anti-Legionella Mode

Built-in automated cycles ensure the tank stays entirely safe and sanitised.

Energy Tracking

View real-time data on how much energy your hot water system is using.

Routine servicing and system care

To keep your heat pump running at maximum efficiency and prevent unexpected breakdowns, follow this simple maintenance schedule.

Every 6 months - Homeowner Check

Clear the vents

Check the air grilles on the top/side of the Monoblock unit for leaves, dust, or debris.

Give it breathing room

Ensure garden plants, fences, or outdoor gear are kept at least 1 metre away from the unit to maintain optimal airflow.

Check the drain line

Ensure the condensate drain line is flowing freely and isn't blocked by garden mulch or dirt.

After 12 months - Professional Service

After the first 12 months, this initial service is vital as it determines the level of ongoing maintenance needed specific to your location and environment. To keep your system running optimally for its full lifespan, book this first annual check-up with Hot Water Shop. Our technician will check the electrical draws, flush the temperature and pressure relief (TPR) valves, and inspect the sacrificial anode that protects your cylinder from internal corrosion.

Book a Routine System Service

Quick Fixes

Before calling for service, double-check these simple fixes:

No power / blank screen

Check your house switchboard and the outdoor isolator switch located near the unit.

Not heating enough

Ensure the unit is set to the correct operating mode and the target temperature is set correctly. Check that the air intake and exhaust are completely clear.

Cold weather performance

In freezing temperatures, the inverter system may run an automated defrost cycle to clear ice from the coils. This is completely normal and ensures it keeps running efficiently.

Tim’s Efficiency Tips

The 60°C sweet spot

By law in NZ, stored hot water must be kept at a minimum of 60°C to prevent legionella bacteria. Keeping it right at 60°C balances safety with maximum heat pump efficiency.

Solar and off-peak optimisation

Got solar panels or a cheap daytime power tariff? Use your smart timer to shift the heating cycle to midday. It’s the warmest time of the day, meaning the heat pump runs at peak efficiency using essentially "free" power!