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Uniform Energy Factor, or UEF, is the U.S. Department of Energy's (DOE) industry standard for measuring water heater efficiency.

Due Today:

$100
More information here
Uniform Energy Factor, or UEF, is the U.S. Department of Energy's (DOE) industry standard for measuring water heater efficiency.

Estimated Delivery:

Begins 2025
More information here

By confirming my reservation, I have read and I agree to the Reservation Agreement, Term & Conditions and Data Privacy Notice. Pricing and specs are subject to change until we build your actual product.

By providing my phone number, I consent to being contacted by Cala via text, SMS, or phone regarding updates to my order or for marketing purposes. I acknowledge that I may opt out at any time.

Due today:

$100 usd
Reserving your Cala is the first step toward ownership. You'll complete your order when production begins.
Phone updates will be sent via automated texts and calls to the number you've provided. This is not a condition of purchase. Message and data rates may apply. Message frequency varies. Opt-out at any time by texting "STOP". Mobile numbers won't be shared with third parties for marketing purposes.