New Zealand households could save more money on their power bills by utilizing smart hot water cylinder controls than by installing solar panels, according to market research. Powerswitch head Paul Fuge told rnz.co.nz and odt.co.nz that heating water accounts for roughly 30 percent of a household’s costs, presenting a big area for people to save money that a survey found 85 percent of people did not know existed.
Hot Water Cylinders Versus Solar Panels For Power Savings
Controlling when hot water cylinders heat up can yield bigger financial returns for large families than solar installations. Paul Fuge noted that running cylinders overnight on time-of-use plans allows consumers to tap into significantly cheaper electricity rates. For large households with children that consume high volumes of hot water, this strategy provides a more surefire path to reducing power bills than investing in solar technology.
At the same time, combining hot water controls with solar creates an ideal setup. Excess solar energy can be directed into heating the water cylinder rather than feeding power back into the grid at lower rates, effectively turning the hot water tank into a household battery.
Smart Meters Replace 1950s Ripple Control Technology
New Zealand has relied on “ripple control” systems since the 1950s, allowing lines companies to curtail hot water demand and prevent grid overloads during peak hours. Modern smart meters and smart devices are now shifting that capability directly to consumers. Households can install smart control devices on existing cylinders, purchase newer models with built-in functionality, or connect through power companies via smart meter links.
EECA research, evaluation and insights lead adviser Gareth Gretton told rnz.co.nz and odt.co.nz that smart load-control technology allows the grid to respond dynamically to renewable energy availability. When wind and sun generate plentiful power, smart systems can heat water cylinders to slightly higher temperatures, capitalizing on clean energy generation.
Wholesale Cost Reductions During Peak Winter Power Use
Smart meter provider Bluecurrent tracked the impact of automated hot water control during winter’s coldest day on August 7. On that single day, 100,000 hot water cylinders equipped with smart meters successfully shifted 81.2 megawatt-hours of power away from evening peak periods. That shift saved between $77,000 and $100,000 in wholesale electricity costs.
Bluecurrent chief customer officer Matt Bostwick stated that households with power company-controlled hot water use 10 percent less electricity overall. A survey conducted by the company revealed that while 85 percent of respondents were previously unaware of the technology, most expressed willingness to participate if guaranteed a real financial saving. Nearly 20 percent of surveyed consumers also cited environmental sustainability as a primary motivation to take part.
Common Questions About Household Hot Water Control
How much of a home’s electricity bill goes toward heating water?
Heating hot water accounts for approximately 30 percent of a typical New Zealand household’s total energy costs, according to Powerswitch head Paul Fuge.
Can renters participate in smart hot water control programs?
Renters can participate because the primary hardware—the hot water cylinder—is already installed in the property; the systems simply need to be connected and activated.
What percentage of New Zealand’s total electricity demand goes to hot water?
EECA research adviser Gareth Gretton stated that simply heating water in residential homes accounts for roughly 10 percent of New Zealand’s entire electricity demand.
How much power did smart meters shift on the coldest winter day?
On August 7, winter’s coldest day, 100,000 hot water cylinders with smart meters shifted 81.2MWh of electricity away from evening peak demand periods, according to Bluecurrent data.
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