A glowing hot tub on a mountain deck at night, with lines of light running from it to the power grid in the valley below.
Smart hot tub control

Hot tubs that rest through peak hours.

HTTM keeps the heater off during your utility's evening peak and lets the tub rest cooler while you're away. It's hot when you get in, and you pay less to keep it that way.

Free

For pilot participants. No subscription, and if your tub needs a Wi-Fi module to get online, we'll provide one at no cost.

~$100a year

Estimated savings on a typical tub, about 15–20% of what it costs to keep hot.

2minutes

To connect, using the app that already runs your tub.

Savings are an estimate from a model of a Colorado tub on time-of-use rates. Yours depend on your tub, its cover and your utility. Pilot results will replace this estimate.

How it works

Same warm water. Different hours.

A hot tub doesn't care when it heats, as long as it's hot when you get in. HTTM moves the heating to the hours when power is easy on the grid.

A day with HTTMExample: 5 to 9pm peak
HeatingPeak hours, heater resting

The tub heats in the afternoon and coasts through peak on stored heat, then tops up after 9pm.

  1. Connect the app you already use

    Sign in with your tub's own app. If your tub is already online, there's nothing to install.

  2. We learn your peak and your soak

    HTTM knows your utility's peak window and when you like to get in, so heat lands at the right time.

  3. The heater rests when it counts

    Heating happens ahead of peak. During peak the heater stays off and the tub holds its temperature.

Comfort mode

Hot when you want it. Resting when you don't.

Most of the day, nobody is in the tub, but it is still held at soaking temperature. HTTM lets it rest cooler while you're away and brings it back up in time for your soak. You never get into cool water, and the heater does less work.

This resting time is where most of the savings come from.

While you're away
92°
Resting
Ready by 7:00pm
102°
Soak temperature
For hot tub owners

Nothing changes in the tub except when it heats.

  • Ready when you areTell HTTM when you usually soak and the water is hot at that time.
  • Cooler when you're awayThe tub rests a few degrees lower between soaks, so you pay to heat it less.
  • Works with the tub you haveHTTM connects through the app you already use for your tub.
  • Help your local gridLess evening demand means less strain on the lines into your valley.
Winter 2026 pilot

We're connecting a small group of tubs in the Colorado mountains this winter.

If you own a hot tub you control from your phone, we'd like to hear from you.

Email us hello@httm.io Tell us your utility and which app runs your tub.