We’re launching a new series highlighting members of our Cala Pro Contractor network — contractors bringing high-performance heat pump water heaters to homeowners across the country.

First up: SumZero Energy Systems in Massachusetts.

Cala installs like other heat pump water heaters. The plumbing and electrical work follow the same general principles homeowners and contractors already know. What changes is what the system can do once it’s installed.

SumZero has built deep expertise in heat pump technology and understands how to evaluate basement conditions, electrical capacity, airflow, and household demand. That foundation matters for any heat pump water heater — whether it’s a standard hybrid or an intelligent system like Cala.

They recently shared their perspective on why they chose to offer Cala to their customers, including how they think about performance, incentives, and long-term value.

You can read their full article here. 

For Massachusetts homeowners, installer experience is especially important. With high electricity rates and strong state incentives, getting the sizing, setup, and rebate process right has a meaningful impact on overall economics.

Cala’s system adds adaptive controls, a variable-speed compressor, and integrated features designed to optimize how and when water is heated. But like any heat pump water heater, outcomes depend on proper installation and commissioning.

We’re proud to work with contractors like SumZero who bring both technical competence and a long-term service mindset to every project.

More Cala Pro Contractor spotlights coming soon.

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