Three honest comparisons of the hot-water options Kapiti homes choose between — upfront cost, running cost, recovery rate, and how each suits different households.
Replacing a failing hot water system is one of those decisions homeowners only make every 10 to 15 years, which means the technology has usually moved on by the time it is your turn. There are three live options on the Kapiti Coast in 2025: a traditional electric cylinder, gas continuous-flow, or a heat-pump cylinder. Each has a place.
Electric cylinder
The default for most New Zealand homes since the 1960s. Stores hot water in an insulated tank, kept warm by an electric element. Simple, reliable, cheapest to install — but the most expensive to run, because you are paying to keep water hot 24 hours a day whether you use it or not.
- Upfront install: ~$2,500 to $4,500 + GST for a like-for-like swap.
- Best fit: small households, rentals, or homes where the existing cylinder runs cheaply on a night-rate tariff.
- Watch-out: oversized cylinders waste energy keeping water hot you never use.
Gas continuous-flow
A wall-mounted unit (Rinnai, Rheem, Bosch) heats water on demand as it passes through. No storage tank, no waiting for a cylinder to recover. Excellent for households with peaky hot-water demand.
- Upfront install: ~$3,500 to $6,000 + GST depending on gas connection and flue runs.
- Best fit: larger households, multiple bathrooms, homes with existing natural-gas or LPG connection.
- Watch-out: bottled LPG is more expensive per unit than natural gas. If you are on bottles, do the maths.
Heat-pump cylinder
A heat-pump cylinder works like a reverse-cycle air-conditioner — it pulls heat from the surrounding air and uses it to warm the water in the tank. Two to three times more efficient than a straight electric element, which over a 10-year life often pays back the higher upfront cost.
- Upfront install: ~$5,500 to $9,000 + GST.
- Best fit: homes planning to stay put for 7+ years, where running cost matters more than install cost.
- Watch-out: heat-pumps need air-flow around them and run a small fan. Indoor installs need ventilation; outdoor installs need shelter.
Which one fits a Kapiti home?
For a small house with one bathroom and an aging electric cylinder, a like-for-like swap is still the most cost-effective choice. For a family home with multiple bathrooms and existing natural gas, continuous-flow is hard to beat. For a household with rooftop solar already feeding the grid, a heat-pump cylinder is often the right long-term call.
Tony is licensed for plumbing and gasfitting and installs all three systems regularly across Paraparaumu, Waikanae and Raumati. Free on-site assessments to work out which fits your home.