Heat Pump Water Heaters, Reinvented — Now with
SumZero and Cala bring Massachusetts the next generation of intelligent heat pump water heaters — reliable hot water, lower bills, and expert installation.
Get Your Cala Water Quote
Why This Partnership Matters
Intelligent Hot Water
High Performance
Future‑ready connectivity
Quiet, compact, installer‑friendly
Built to Last, Backed to Prove It
The #1 Heat Pump installation team in Massachusetts, delivering precision and trust on every project.
When Innovation Meets Expertise
When Innovation meets Expertise, homeowners win. Cala is redefining what a water heater can do, bringing intelligence, connectivity, and future-ready design to hot water. SumZero is the #1 Heat Pump installation company in Massachusetts, trusted for precision, transparency, and high-quality installs. Cala knows hot water. We know how to install heat pump technology the right way. Together, it’s a partnership built to deliver comfort, savings, and confidence for years to come.
Smart water heating reimagined with predictive controls, app integration, and future-ready design.
Cala Systems has reinvented the water heater with intelligence at its core. Instead of simply heating water when the tank cools, Cala predicts household usage, runs at the most efficient times, and delivers up to 50% more hot water with its built-in mixing valve. Backed by advanced sensors, a variable-speed compressor, and a user-friendly app, Cala transforms water heating into a connected, reliable, and sustainable experience.
Smarter by Design
With predictive intelligence, Cala learns your home’s daily rhythm — from morning showers to evening laundry — and adjusts automatically to keep comfort high while keeping bills low. Its app and installer portal also provide real-time insights, proactive maintenance alerts, and seamless integration with solar or battery systems, ensuring your water heater works with your home, not against it
Your water heater should save money, not drain it.
Cala is built to deliver both comfort and savings. Priced at $2,850 before rebates and tax incentives, it quickly becomes one of the most affordable long-term choices for homeowners once you factor in rebates, tax credits, and dramatically lower annual energy use. Compared to natural gas, electric resistance, oil, or propane systems, Cala can save families thousands of dollars over its lifetime while cutting energy use by more than half.
Unlock Your Savings
But Cala isn’t just about cost. It’s about intelligence. With predictive controls, an integrated mixing valve, and app-based insights, Cala ensures hot water is always ready when you need it — while running at the most efficient times of day. And with features like solar synchronization, outage preparation, and a 10-year transferable warranty, Cala brings more than hot water: it brings peace of mind and a future-ready home.
Things to Consider When
Choosing a Hot Water Solution
Smarter, more efficient, and designed around your family’s comfort and savings.
Cala delivers up to 50% more hot water by adjusting tank temperatures and using its built-in mixing valve, so your family won’t run out during busy mornings.
By heating water at the right time, speed, and temperature for your home, Cala reduces energy use while keeping hot water ready whenever you need it.
Cala learns your household’s routine, connects with solar systems, and tracks usage through its app — helping you see savings and performance in real time.
With a 65-gallon tank, Cala is built to serve households of up to five people and can prepare up to 90 gallons ahead of high-demand periods.
Whether it’s showers, laundry, or dishwashing, Cala uses predictive controls to preheat hot water so your home never misses a beat.
When operating, Cala produces air similar to a dehumidifier — a side benefit that can help keep basements or utility spaces more comfortable.
Need It
Cala requires about 77 inches in height and 34 inches in width and depth, making it compact enough for most Massachusetts homes.
From solar integration to app-based monitoring, Cala is designed not just for hot water today but for the future of energy-smart living.
Why Settle for Old Hybrids
When Cala Does More?
Cala gives you smarter controls, steadier comfort, and lower bills — everything legacy hybrids can’t deliver.
Cala + SumZero: The Smartest Partnership for Massachusetts Homeowners and the Future of Electrification
At SumZero Energy Systems, we’ve installed every kind of hot water technology — and we know what works in New England homes. Partnering with Cala isn’t just about offering another water heater. It’s about giving Massachusetts homeowners the very best option for today and tomorrow. Cala’s intelligent heat pump water heater brings cleaner, smarter heating that saves money now, while setting up every household for the larger electrification movement already shaping our future. Together, Cala and SumZero make upgrading more than a project — it’s an investment in comfort, savings, and a cleaner legacy for generations to come.
Homeowners Trust the Heat Pump Experts at SumZero
Our customers value the care, expertise, and white-glove service we bring to every installation.
Ready to Make the Switch Today?
Upgrade to Cala’s intelligent heat pump water heater and enjoy comfort, savings, and innovation working for you from day one.
Learn More About CalaImportant 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 $5,000 after an instant rebate — reflects a typical installation scenario and applies to approved estimates through December 31st, 2025.This pricing already includes the $750 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.