Gas vs Electric Hot Water in Christchurch

When it is time to replace a hot water system in Christchurch, one of the most common decisions homeowners face is whether to stick with electric or switch to gas. Here is an honest comparison for Canterbury homeowners.

Running Cost Comparison

Electric hot water — Standard electric cylinders are relatively expensive to run at current Canterbury power prices. A typical 2–3 person household spends approximately $600–$900 per year heating water electrically.

Gas hot water — Gas is currently cheaper per unit of energy than electricity in Christchurch, making gas hot water cheaper to run. A similar household using gas typically spends $350–$550 per year on water heating. That is a saving of approximately $250–$400 per year.

Installation Cost Comparison

Electric cylinder replacement: $1,200–$2,200 installed

Gas cylinder installation (existing gas): $1,800–$2,800 installed

Gas installation (no existing gas connection): Add $1,500–$3,000 for new gas connection

If you already have a gas connection, the payback period for the additional installation cost is typically 3–5 years in running cost savings. If you need a new gas connection, the payback period extends to 8–12 years, making the switch less compelling unless you are also adding a gas cooktop or heating.

Performance Comparison

Modern mains pressure electric cylinders perform very well for most households. Gas continuous flow systems have a performance edge in high-demand situations — they genuinely never run out of hot water and provide consistent temperature regardless of usage. For large families or homes with multiple bathrooms in use simultaneously, gas continuous flow is hard to beat on performance.

Which Should You Choose?

Choose electric if: you do not have a gas connection, you are on a budget, the switch savings do not justify connection costs, or you are planning to install solar panels (solar + heat pump hot water is an excellent combination).

Choose gas if: you already have a gas connection, you have a large family or high hot water demand, or running cost savings are a priority.

Our team can assess your specific situation and provide an honest recommendation based on your home and usage patterns — not on which system is more profitable for us to install.