Hot Water Systems Auckland

Hot Water System Comparison

	Electric Cylinder	Gas Cylinder	Gas Continuous Flow	Heat Pump
Installed Cost	$2,499 — $4,999	$4,199 — $4,899	$3,599	$6,399 — $8,699
Running Cost	$800 — $1,200/yr	$500 — $800/yr	$400 — $700/yr	$250 — $400/yr
Best For	1 — 3 people, no gas	3 — 5 people, gas available	Large households, high demand	Eco-conscious, long-term savings
Recovery Time	1 — 2 hours	30 — 45 mins	Instant	2 — 4 hours
Lifespan	10 — 15 years	10 — 15 years	15 — 20 years	15 — 20 years
Gas Required	No	Yes	Yes	No

All prices incl. GST — supply, installation, and certification included. We provide a fixed quote before starting any work.

Water & Gas Worx supplies, installs, repairs, and replaces hot water systems across all of Auckland, New Zealand.

Call 0800 322 322 for Rinnai Infinity continuous flow from $3,599, electric cylinders from $2,499, gas storage from $4,199, and heat pump hot water from $6,399 — all prices include GST, supply, installation, certification, and old unit removal.

Written and reviewed by Peter — qualified plumber and certifying gasfitter, PGDB registered, 17+ years experience. Last updated April 2026.

Frequently Asked Questions

How much does a hot water system cost in Auckland?

Electric cylinders cost $2,499 to $4,999 installed (Rheem Low Pressure 135L through to Rheem Optima 300L). Gas storage cylinders (Rheem Stellar) are $4,199 to $4,899 installed. Gas continuous flow systems (Rinnai Infinity A26, Rheem Integrity 27) are $3,599 installed. Heat pump systems range from $6,399 to $8,699 installed. All prices include supply, installation, and removal of the old unit.

What size hot water cylinder do I need?

For 1-2 people, a 135-litre cylinder is usually enough. For 3-4 people, go with 180 litres. For 5 or more people, a 250-300 litre cylinder or a continuous flow system is the better option. We can advise based on your household.

Can you convert my electric hot water to gas?

Yes. We handle the full changeover from electric cylinder to gas continuous flow, including removing the old cylinder, running gas pipework, and installing the new unit. All gas work comes with a Gas Safety Certificate.

Can I get a same-day hot water installation?

Yes. If you call before 9am, we can usually install a new hot water system the same day. Common systems including Rheem electric cylinders and Rinnai Infinity continuous flow units are readily available from our suppliers for same-day installation.

Gas vs electric hot water — which is cheaper to run?

Gas is cheaper to run than electric in most cases. A gas continuous flow system costs around $400-$700 per year to run, compared to $800-$1,200 for an electric cylinder. Heat pump systems are the cheapest at $200-$400 per year.