Hydrolevel

About Hydrolevel: Pioneering Boiler Safety Since 1965

Hydrolevel has been at the forefront of boiler protection technology for more than six decades. Boiler safety controls and aquastats are the cornerstone of the brand's identity — and for good reason. The company was founded in 1965 by Michael DeLeonardis, an engineer specializing in steam pressure vessels who recognized a critical flaw in the float-type level controls that dominated the industry at the time.

The mechanical linkage used in those early float controls was no match for the harsh environment inside a working boiler. DeLeonardis witnessed firsthand the costly — and sometimes dangerous — consequences of a dry-fired boiler. His solution was elegantly simple: by harnessing water's natural ability to conduct electricity, he designed a non-moving electrode probe that could accurately detect water level inside a boiler without any moving parts to fail. The result was the iconic Safgard trademark, and the first probe-type low water cut-off (LWCO) was born.

That founding innovation still resonates throughout Hydrolevel's product line today. Based in North Haven, Connecticut, where all products are manufactured domestically, Hydrolevel has grown its portfolio into a comprehensive suite of boiler protection solutions. Modern offerings include the CycleGard foam-compensating cut-off, the programmable VXT Water Feeder, the HydroStat multi-function control combining temperature limiting, LWCO, and fuel-saving boiler reset in a single device, and the 1100 Series Mini controls designed for compact installations.

Who Uses Hydrolevel Products?

Hydrolevel serves residential homeowners, commercial building operators, and industrial facilities — any application where a hot water or steam boiler is in service. Heating contractors and boiler service technicians have long relied on Hydrolevel's probe-type controls because they eliminate the single greatest maintenance vulnerability of older float designs: mechanical wear. With no moving parts, probe-based LWCOs deliver consistent, reliable operation across years of service.

The brand's HVAC sensors and probes extend this electrode expertise into broader hydronic system monitoring, while boiler repair parts — including replacement probes and Electro-Well insertion components — ensure that existing Hydrolevel installations can be maintained and serviced for the long term.

A Legacy of Innovation and Trust

Hydrolevel is widely recognized as the manufacturer with the longest track record in electronic low water cutoff technology. Partnered with sister company Carlin Combustion, Hydrolevel operates from a 250,000 square-foot facility and continues to push the boundaries of boiler safety and efficiency. Whether you are protecting a residential steam boiler or a large commercial hot water system, Hydrolevel's control solutions are engineered to provide peace of mind, prevent equipment damage, and reduce fuel waste.