Electric bills are going up.
Your water heater is a hidden reason.
For most homes, water heating is 15-20% of the bill — and it often runs during the most expensive hours.
ThermoSave makes your water heater smart — so you don’t overpay.
One of the few parts of your electric bill you can control.
✈️ Own a rental or second home?
Turn off hot water when you’re away →
Designed for standard electric resistance tank water heaters. No plumbing changes.
Your water heater is costing you more than it should
Most homes spend $400–$700 per year on electric water heating — and it’s increasing
The second largest expense on your utility bill
Most homes overpay for hot water — because it runs during expensive hours.
What’s going wrong today
📈💸 Heats during peak prices
🔥⏳ Wastes energy when no one is using hot water
🌞❌ Misses cheaper, cleaner energy
ThermoSave fixes all three — automatically.
How it Works
Avoid expensive peak electricity
ThermoSave dynamically adjusts when your water heater runs, preventing costly heating as prices and usage change.
Store energy as hot water
Your water heater holds heat, so it doesn’t need to run constantly.
Use hot water as needed
Enjoy hot showers anytime — without changing your habits.
A typical electric water heater already stores ~10 kWh of energy as hot water.
Works with standard electric resistance tank water heaters (no plumbing required).
See and control your hot-water battery
Track hot-water availability, heating power, and electricity prices — and see why ThermoSave heats when it does.
Preview of the ThermoSave app (features and UI will evolve).
ThermoSave shows when heating happens, how much power is used, and which price signal triggered it.
🔍 Always know why it’s heating
Available hot water is shown as a charge level — so you instantly know if you’re ready for showers, dishes, or guests.
🔋 Hot water as a battery
🧩 Works with your energy stack
Integrates with Home Assistant for live data, automations, and user-defined constraints.
Turn off water heating when you’re away, and have hot water ready when you’re back — no wasted energy.
✈️ Away mode (vacations & rentals)
Built for people who want visibility, not guesses.
Used in real homes
We’re a family of five and have used ThermoSave for over six months. We’ve never run out of hot water, and it automatically adjusts as electricity prices change day to day.
— Mike D.
My water heater is over 15 years old, and I didn’t want to replace it. After installing ThermoSave, my water-heating electricity costs dropped by about 20%.
— Alex H.
See if ThermoSave makes sense for you
Most homes save hundreds per year
See a quick estimate for yours.
Great for vacations, second homes, and rentals
Just like a smart thermostat, but for hot water.
Learn how Vacation Mode works →
“We've never run out of hot water.”
Reserve yours
Easy installation
Install it yourself in under 30 minutes, or have a local electrician help if you prefer.
Uses your electricity pricing, learns your hot-water usage, and schedules heating when energy is cheapest — without manual setup.
Automatic optimization
Save without changing your habits, or follow simple suggestions to save even more. Many households save up to $1,000 or more over 5 years. Estimate your savings.
Ongoing savings
Be among the first to save on water-heating costs.
Early access to product updates and development progress.
Estimated shipping start: Q2 2026.
Expected final price around $179 — early access customers pay less.
$19 refundable deposit — final price confirmed before shipping.
Cancel anytime for a full refund before your unit ships.
Initial production quantities are limited.
Who we are
ThermoSave is designed and tested in real homes — including our own.
We're a small team of engineers and product builders with decades of experience designing, shipping, and operating connected hardware used in homes and businesses today.
Our backgrounds span embedded systems, large-scale device fleets, cloud-connected products, and home energy — including systems that manage millions of devices in the field. We're starting anew with water heating because it’s one of the biggest, least visible energy costs in electrified homes, and one of the easiest to improve without changing how people live.