Energy Conservation Unit or also known as a Hot Water Heat Exchanger

• 230 volt wiring for easy connection to compressor contractor
• Factory wired and preset controls
• Fully automatic operation
• High-Efficiency Vented Double-Wall Heat Exchanger
• Water lubricated low wattage Circulator

• Grounded electrical circuit
• Sturdy Aluminum Cabinet with baked enamel finish for outdoor or indoor use
• ARL listed Appliance, with UL approved components
• Freezestat option available

AC Overstock is proud to present some of the finest, most cost-effective, energy-efficient air handlers in the industry. When choosing a heating and cooling system, look at the service and support provided by the dealer. As a factory authorized dealer, AC Overstock has over 40 years extensive training in the installation and care of your equipment. That means we can help you select just the right system and keep it in top operating condition.

Any air conditioner or heat pump that produces hot refrigerant at temperatures above 130° F as the gas leaves the compressor is suitable for desuperheating; that includes models that use the new R410 refrigerant. They also work with all brands, limited only by temperatures. The hotter the refrigerant gets when your air conditioner is running, the more heat you can extract and turn into hot water. The higher the energy efficiency (SEER) rating, the cooler the refrigerant temperature may be, giving the Heat Recovery Unit less to work with and slowing the production of free hot water. Some super high SEER models (18 SEER and up) don't always get hot gas temperatures above 130° F. The desuperheater doesn't operate under this condition. Ask your A/C contractor about the SEER and the operating hot gas temperature of the air conditioning system that is being presented to you, so you can make your own informed decision.

The ECU Hot Water Generator Exchanger

The ECU is connected to a water heater and an air conditioner, heat pump, or refrigeration compressor. A small pump circulates “cold” water from the bottom of the water heater tank through the heat exchanger within the ECU where it interacts with the hot refrigerant gas from the compressor via a heat exchanger.

The resulting heated domestic water is then pumped back to the water heater. Reclaiming waste heat from high compressor discharge temperatures is a proven principle of energy recycling that produces abundant hot water safely and economically.

A 125 degree hot gas cut-in thermostat insures the ECU only runs when waste heat is available from the refrigerant system, a necessity for heat pumps. The 140 degree hot water cut-out thermostat shuts the system down when the incoming water is 140 degrees, indicating a full tank of hot water. Other options include: /F - freeze thermostat that activates the water pump should temperatures in the ECU itself approach 32 degrees (freezing); /V - bleed type ball valves for draining the unit in the winter; /PC - hand valves with high pressure blow-off’s when needed for local code compliance; /R-410A - tested and approved for both R-410A and R-22.
We offer a dual coil single pump model for when you have two AC’s or Heat Pump’s units located near each other, enabling easy compact installations with either or both units returning “free” heated water to the water heater.

The ECU heat recovery unit also reduces the compressor load, which increases compressor efficiency and extends compressor life. The ARL test indicates a full 1+ seer increase in the AC or Heat Pump system efficiency. This is great benefit in these tough times, besides providing your customer with “free” domestic hot water.