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.

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Why This Partnership Matters

Intelligent Hot Water

It adapts to your household's patterns for comfort and savings.

High Performance

Low energy use — heat pump efficiency with modern controls.

Future‑ready connectivity

Designed to integrate with solar and batteries.

Quiet, compact, installer‑friendly

Design for New England homes.

Step Into the Future of Hot Water

The #1 Heat Pump installation team in Massachusetts, delivering precision and trust on every project.

What You’ll Get

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.

Custom system design matched to your household’s usage and space

Professional installation by licensed, Mass Save®–participating experts

Best-in-class commissioning to ensure peak performance from day one

Transparent guidance on rebates, tax credits, and financing options

Ongoing support and maintenance to protect your investment

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.

More Hot Water, When You Need It

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.

Lower Bills Without Sacrificing Comfort

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.

Smart Sync With Your Home

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.

Sized for Real Homes

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.

Built-In Comfort Planning

Whether it’s showers, laundry, or dishwashing, Cala uses predictive controls to preheat hot water so your home never misses a beat.

Cool, Dry Air as a Bonus

When operating, Cala produces air similar to a dehumidifier — a side benefit that can help keep basements or utility spaces more comfortable.

Fits Where You
Need It

Cala requires about 77 inches in height and 34 inches in width and depth, making it compact enough for most Massachusetts homes.

Ready for Today and Tomorrow

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.

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