For home owners
The battery you already own.
Heat your house and your hot water on cheap night power and your own rooftop solar. Coast through the expensive evening peak on the heat the building already holds. Stay comfortable, and cut the bill — without buying a home battery.
The problem
Nothing in your house is talking to anything else.
The heat pump runs at the worst hour
It heats when the thermostat says the house is cold — 7am and 6pm — which is precisely when a time-of-use tariff charges you the most.
Your solar is sold cheap
Midday export earns a handful of cents per kilowatt-hour. That same energy costs several times as much when you buy it back after dark.
A battery is a lot of money
Five figures of capital to shift a few kilowatt-hours a day — while the slab under your feet and the cylinder in the cupboard store far more, for free.
The answer
Control, not capital.
WattDodger treats your building fabric and your hot-water cylinder as one storage system, and schedules the heat pump against tomorrow's prices, the weather, your solar forecast and your week. It fills the stores when power is cheap or free, and backs off when it isn't.
You feel none of it, except in the bill. The house holds temperature because a well-insulated building gives its heat back slowly — on the reference house, the self-learned free-cooling time constant is about 18 hours.
- Self-consume your solar by turning it into stored heat instead of a small export credit.
- No capital hardware. Compare that with the price of a Powerwall.
- Dodge the peak on both the electricity price and the grid's carbon intensity.
- A transparent dashboard showing what it did, why, and what it saved against a flat thermostat plan.
- Weekly schedule and presence — it learns when you're actually home.
- It gets better. Every cycle refines the model of your particular house.
Run the numbers
Don't take our word for it.
The interactive thermal-battery simulator models what load-shifting alone is worth on a house like yours — smart control only, no battery. Change the insulation, the tariff, the solar, and watch the bill move.
Savings depend on your tariff, your house and your habits. Figures on this site and in the simulator are modelled from measured house data — typical results, not a guarantee.
Early access
Put your thermal battery to work.
WattDodger is rolling out to its first New Zealand homes. Tell us what you have and we'll be in touch as places open up.
Prefer email? lee.mauger@kiwicollaborative.com