Important Information About Pricing, Installation, and Warranties. At SumZero Energy Systems, transparency and precision are part of everything we do. The listed price for Cala’s Smart Heat Pump Water Heater — approximately $5,500 after an instant rebate — reflects a typical installation scenario .This pricing already includes the $1,050 stackable instant rebate, which remains valid regardless of final adjustments based on your home’s installation complexity. The rebate is available to all homeowners, whether or not they are existing customers or members of SumZero’s maintenance program. This offer cannot be combined with any other coupons or promotions. Pricing and Site Conditions - Every home is unique, and so is every installation. The estimated price applies to standard, low-to-moderate complexity installations — typically where: The existing water heater is located in an accessible basement or utility area.There is direct or walk-out access to the installation space. Electrical and plumbing connections are within standard proximity. Factors such as limited access, structural constraints, relocation of the unit, or additional electrical or condensate line work may influence the final cost. All these details are reviewed during our pre-installation assessment walkthrough, ensuring you receive a clear and accurate quote before work begins. Our goal is to provide every homeowner with a smooth, efficient installation — completed in hours, not days, by Cala-certified technicians trained to meet Massachusetts’ safety and performance standards. Warranty and Peace of Mind - Cala and SumZero stand behind your system with unmatched coverage and ongoing care: 10-Year Warranty on Parts — Every component is protected for a full decade. 3-Year Warranty on Labor — Your installation workmanship is fully covered. Remote System Monitoring — With your permission, SumZero receives diagnostic alerts for errors or performance issues, allowing us to perform proactive maintenance before problems arise.