Switching from Gas Hot Water to Electric with Solar Power in New Zealand

If your home currently uses gas for hot water, have you considered switching to an electric hot water cylinder and combining it with solar panels?

With rising interest in household energy efficiency, more New Zealand homeowners are looking at ways to reduce their reliance on gas and make better use of renewable energy.

By switching from gas hot water to an electric hot water cylinder and pairing it with a solar PV system, you can use your own solar electricity to heat water during the day.

Here's what you should consider before making the switch.

1. Why Consider Switching from Gas to Electric Hot Water?

Gas hot water systems have been a common choice for many New Zealand homes. However, depending on your gas supply, usage and pricing, running costs can add up.

Switching to an electric hot water cylinder offers several potential benefits:

• Reduce reliance on natural gas.
• Make use of electricity generated by your own solar panels.
• Store hot water for use later in the day.
• Reduce household dependence on energy purchased from the grid.

The overall benefit depends on your current gas costs, electricity tariff, hot water usage and the cost of upgrading your system.

2. Combine an Electric Hot Water Cylinder with Solar Panels

One of the biggest advantages of switching to electric hot water is the opportunity to use solar electricity to heat your water.

Solar panels generate electricity during the day, often producing more than a household immediately needs.

Instead of exporting all surplus electricity back to the grid, you can use it to heat your electric hot water cylinder.

This effectively allows your hot water cylinder to store energy in the form of heated water.

3. How Can You Maximise Solar Power for Hot Water?

There are several ways to coordinate your hot water cylinder with your solar system.

Option 1: Timer or Smart Switch

Set your hot water cylinder to heat during the middle of the day, when solar generation is generally higher.

This is a simple way to increase the use of daytime solar electricity.

Option 2: Solar Diverter or Smart Energy Controller

A compatible solar diverter or smart controller can monitor excess solar generation and use available surplus electricity to heat your hot water.

This helps make better use of solar energy rather than exporting it all back to the grid.

For households looking to maximise solar self-consumption, this can be a particularly useful option.

4. Do You Need a Solar Battery?

Not necessarily.

A properly sized electric hot water cylinder can act as thermal energy storage.

You can use solar electricity to heat water during the day and then use that hot water in the evening.

This means you can increase your solar self-consumption without necessarily investing in a home battery.

A battery may still be useful for other household electricity needs, but it is not essential for solar-powered hot water.

5. Is Switching from Gas to Electric Worth It?

It depends on your existing gas system, household energy consumption and the cost of upgrading.

Before making a decision, consider:

• Your current gas bills and daily hot water usage.
• The cost of installing a new electric hot water cylinder.
• Electrical connection and installation requirements.
• Your solar system size and expected daytime generation.
• Available electricity and gas tariffs.

A suitable assessment can help you understand whether switching makes financial sense for your household.

6. Make Your Home More Energy Efficient with Solar

Switching from gas hot water to electric and combining it with solar panels can be a practical way to move towards a more energy-efficient home.

At Solar Republic, we help homeowners explore solar solutions based on their roof, electricity usage and future energy needs.

If you're considering installing solar panels or upgrading your hot water system, get in touch with our team to discuss the options for your home.

Solar Republic – Helping New Zealand Homes Make Better Use of Solar Energy.