On 7/9/2025, a client requested help locating a contractor to supply/install a Sanden Sanco water heater. I did a Goole search on how to locate distributos and contractors for Sanden Sanco water heater.
https://eco2waterheater.com/about-us/
ECO₂ Systems LLC was founded by John Miles and Maho Ito in January 2020. Formerly employees of Sanden Corporation of Japan, John and Maho were tasked with introducing Sanden’s CO₂ Heat Pump Water Heater products to North America in 2015. Since then, they have worked to establish and grow the market for these innovative products
In January 2020, John and Maho negotiated the purchase of Sanden’s water heater business in North America, re-branding as ECO₂ Systems and opening the door to the introduction of complementary products from other manufacturers.
ECO₂ Systems is committed to providing comfort to our customers through the development and distribution of high quality, high-efficiency heating, cooling and hot water products using low GWP refrigerants, minimizing the environmental impact.
Nearest Distributors  of ECO2 systems to Middletown, NJ:  F.W. Webb, located in Manasquan and Piscataway and other points in NJ  (from a map of distributors at this web site).
To locate a qualified contractor for theSanden Sanco 2: call the nearest distributor, and ask for the names/locations/conact of contractors who have recently purchased the highest volume purchasers of the ECO2 water heater systems
F.W. Webb is the largest wholesale distributor of plumbing, heating, cooling, HVAC/R, LP Gas and industrial products in the Northeast. We are a family-owned business with roots that date back to 1866. Our company has grown from a single location to more than 100 across nine...
Some guidance on contractors at https://eco2waterheater.com/where-to-buy-residential/
Browse thru this URL, and you will find a form to complete & submit if you have difficulty finding a contractor.
Steve's comments: These  CO2 based heat pumps use MUCH HIGHER pressures, and heavier tubing and fittings. However, the high pressures are totally contained within the outdoors unit. Any refrigerant links will result in the lowest possible climate warming impact.