Reservoir raises $8M to scale its in-house water-heater installation model

Why it matters

Reservoir is betting that climate hardware wins through service and distribution as much as efficiency. Owning installation gives it customer access and operating data, but adds labor and geographic complexity before grid revenue is proven.

Reservoir, the Boston water-heater maker founded by Luke Winston-Almanzar, Gabriel Parisi-Amon and Jake Felser, raised an $8 million seed round led by Asymmetric Capital Partners, according to TechCrunch's August 12 report. Founder Collective and MCJ also participated.

The financing follows a previously reported $5 million seed round. Including the new round, publicly disclosed financing totals at least $13 million. Reservoir plans to use the new capital to increase installations across New England. Its current service area includes Massachusetts, southern New Hampshire and southern Maine.

That distribution strategy carries Winston-Almanzar's fingerprints. Before starting Reservoir, he spent more than a decade helping build Formlabs, eventually serving as chief business officer at the 3D-printing manufacturer. Reservoir is applying one of his lessons from Formlabs: a novel hardware product cannot depend on an established channel that has little incentive to learn how to sell or service it.

"The typical water heater is devoid of intelligence, it's using a god-awful amount of energy, and my air fryer is smarter than it," Winston-Almanzar told TechCrunch.

A hardware team built for the basement

Winston-Almanzar found his co-founders through the MCJ climate network in 2023. The three brought different parts of the hardware stack Reservoir would need.

Parisi-Amon previously worked in iPhone supply-chain operations at Apple and co-founded Nebia, a water-efficiency startup that emerged from Y Combinator and was acquired in 2023. Felser was CTO at Freight Farms and vice president of engineering at Eatsa, where he worked on systems spanning refrigeration, robotics and food assembly. An MCJ investment note describes a founding team assembled around consumer hardware, hydronics, industrial controls and direct distribution.

Reservoir's product is an all-electric heat-pump water heater that combines a storage tank, four heating elements, industrial controls and software that predicts a household's hot-water demand. TechCrunch reported that the system collects usage data during its first month, then schedules heating when electricity is cheaper or grid demand is lower while maintaining enough hot water for the household's expected needs.

Reservoir's current technical specifications list a 47-gallon nominal capacity, a 75-gallon first-hour rating and virtual capacity of up to 150 gallons. They also list a 3.53 uniform energy factor, an ultrasonic flow meter, automatic leak shutoff, electronic corrosion control and a 10-year hardware warranty. The Max model adds recirculation for hot water at the faucet and controls designed to reduce the risk of frozen pipes. Those capacity, efficiency and protection figures come from Reservoir's own specifications and have not been established through independent field testing.

The plumbing crew is part of the product

Reservoir has started its own plumbing operation rather than handing installation to distributors or independent contractors. Winston-Almanzar told TechCrunch that Formlabs also built direct customer relationships when existing distributors resisted unfamiliar technology.

Reservoir's installation service says its team prepares quotes, handles permitting and rebates, performs installations and handles service calls. The Core model costs $5,000 installed and the Max costs $6,500, TechCrunch reported. A $1,050 Massachusetts rebate reduces those prices to $3,950 and $5,450, respectively, for qualifying residents.

Owning the job from assessment through service removes several points where home-electrification projects tend to stall. It also makes Reservoir a geographically constrained service operator. Expansion requires trained crews, local permitting knowledge and enough installation density to keep labor productive. Software can move across state lines instantly; plumbers and water heaters cannot.

Reservoir says an online assessment takes about five minutes and a typical installation takes half a day. The direct model should also produce operating data from each installation, giving Reservoir visibility into product performance, household usage and service costs that an appliance maker working through wholesalers might never see.

That information will matter as Reservoir tries to make its grid argument credible.

From 100 basements to flexible grid capacity

Reservoir had installed about 100 units by August 12 and aims to reach roughly 1,000 by the end of 2027, Winston-Almanzar told TechCrunch. He said a fleet of that size would begin to represent megawatt-scale capacity.

The underlying idea is straightforward. A water tank can store energy as heat, allowing Reservoir to shift electricity consumption away from expensive, high-demand periods without asking a homeowner to change when they shower. A sufficiently large fleet could eventually participate in utility demand-response programs, which pay customers or aggregators to reduce load when the grid is strained.

That utility business remains prospective. Winston-Almanzar said Reservoir is exploring how demand-response payments could lower appliance prices. Reservoir's current proposition still rests on selling and installing a better household appliance: lower claimed energy use, more available hot water, leak detection and faster delivery at the faucet.

Reservoir is entering an active category. Cala Systems began shipping its predictive heat-pump water heater in September 2025, also pitching software-controlled hot water as a source of flexible electrical demand. Reservoir's in-house plumbing operation is its clearest commercial distinction because it addresses the replacement decision itself. Most homeowners buy a water heater after the old one fails, leaving little time to research unfamiliar equipment or find a specialist installer.

The new round gives Reservoir the capital to test whether direct installation can overcome that purchasing pattern. Its target requires a tenfold increase from the approximately 100 devices installed so far. Reaching 1,000 homes would produce a more meaningful field record for Reservoir's savings and reliability claims while showing whether a local plumbing operation can become a repeatable market-entry system.

Winston-Almanzar has already spent a decade scaling one category of technical hardware through direct customer relationships. Reservoir now needs to prove that the same playbook can work in a harsher environment: cramped basements, emergency replacements and an appliance market where the installer often decides what the customer buys.