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ThermoSave

ThermoSave

Cut your electricity bill

4 ratings
2 reviews
🔧 Utilities
📊 Productivity
Free

Details

  • Released
  • Updated
  • April 23, 2026
  • September 18, 2026

Features

Developer

ThermoSave
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About

This app intelligently manages your electric water heater to reduce electricity costs. It heats water during off-peak hours, ensuring you always have hot water without incurring high charges. The system works with most standard electric water heaters and major US utility plans.

✓Automated off-peak water heating
✓Reduces electricity bills
✓Ensures hot water availability
✓Works with existing water heaters
✓Easy installation
✓Compatible with major US utilities
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What's New in ThermoSave

1.4.0

September 18, 2026

Energy on your Home screen See what your water heater used each day, and when it actually drew power. Drag the chart left or right to move between days, or tap the date to jump back to today. Press and hold anywhere on the chart to read any five minutes — the time, the draw, and whether the heater was powered. Today's card fills in as the day goes on and marks where "now" is. The chart works with VoiceOver: it reads out the day's energy and powered time, and offers actions to move between days. Your heater's clock, not your phone's Times across the app now follow the timezone your water heater is set to. If your heater isn't in the same timezone as you — or you're travelling — energy history and peak hours now line up correctly. Device info shows your heater's timezone, so you can check which clock it's running on.

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User reviews

Most RecentHighest RatedLowest Rated

Solid!

I was skeptical at first, but ThermoSave has genuinely changed how I think about home energy use. It automatically shifts water heating to lower-cost windows throughout the day, and my electricity bill reflects.

We haven’t run out once since installing it. If you have an electric water heater, this is a no-brainer.
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R-Man-1980R-Man-1980

Easy to get started

Setup of the device was very easy, took just a few minutes.
TycasteTycaste

FAQ

How much can ThermoSave save me on electricity bills?

Users can expect savings of up to $200 - $500 per year or more on Time-of-Use (TOU) utility plans. These savings are achieved by automatically heating water during cheaper off-peak electricity hours.

Does ThermoSave require a plumber for installation?

No, ThermoSave is designed for easy installation and does not require a plumber. It works with your existing electric resistance tank water heater.

What type of water heaters is ThermoSave compatible with?

ThermoSave is compatible with standard electric resistance tank water heaters (240V). It is not designed for gas water heaters or tankless electric models.

Which US utilities support ThermoSave?

ThermoSave is compatible with major US utilities that offer time-of-use rate plans, including APS, PG&E, and Xcel Energy, among others.

What are the requirements to use ThermoSave?

To use ThermoSave, you need the ThermoSave hardware controller, which is available for purchase separately. A WiFi connection is also required during the initial setup process.

How often is ThermoSave updated?

The latest version of ThermoSave is 1.3.0, and it was last updated on June 23, 2026. Updates typically focus on improving performance and compatibility.

What is the age rating for ThermoSave?

ThermoSave has an age rating of 4+, making it suitable for a wide range of users. The app itself does not contain any mature content.

Does ThermoSave have ads?

No, ThermoSave does not contain advertisements. As a free utility app, it focuses on providing its core functionality without interruption.