Stiebel Eltron Accelera 300 E Heat Pump Water Heater

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The Accelera® E extracts 80 percent of the heat it needs to make hot water from the energy in ambient air. The heat pump draws only 650 watts and every watt it uses generates 3–5 watts of hot water. In warm climates, the unit can be placed in a garage, where it uses the heat from the outside air; or inside the house, where it helps with air conditioning. In cooler climates, it is typically placed in a basement where it also dehumidifies the basement.

An Accelera® works like an air conditioner, but instead of transferring the heat to the outdoors, it transfers heat into the tank of water. This process is many times more efficient than any other type of water heater. It works like this:

• The fan moves room air through the evaporator, which contains liquid refrigerant that extracts heat from the ambient air as it evaporates. As the refrigerant warms, it changes into a gas.
• The warm gaseous refrigerant passes through the compressor which increases its pressure. As the pressure increases, the temperature of the refrigerant rises until it becomes hot.
• The hot refrigerant then passes through the condenser wrapped around the water tank. Because heat travels from hot to cold, the heat in the refrigerant transfers to the water in the tank.
• The refrigerant, having transferred its heat to the water is now a super-cool liquid. It then passes through the expansion valve to become a warmer, yet still cold, liquid, ready to become a gas again in the evaporator and continue the cycle. Accelera® heat pump water heaters use environmentally-friendly R134a for refrigerant.

Digital display: The Accelera® 220 E and 300 E have a simple-to-operate end user menu that is accessed through the electronic display. The display also shows performance information, including total volume of hot water available. Accelera® is “smart meter” ready and options are accessed through the display.

Easy access for service: The entire top of an Accelera® 220 E and 300 E can be quickly removed for easy servicing from all sides.

Redesigned air flow: Air intake and exhaust are angled to allow opportunity for installation in compact spaces. In addition we decreased noise by separating the airflow from the refrigerant loop and increasing fan diameter.

Impressed current anode corrosion protection: The Accelera® 220 E and 300 E are equipped with an electronic anode for maintenance-free protection instead of an anode rod. This system also provides protection with the minimum current necessary as opposed to a steady-on system.

The condenser: The Accelera® 220 E and 300 E have a rollbond wrap-around condenser because it prevents refrigerant contamination of the water, mitigates hard water problems (in conjunction with the glass-lined tank), and is the best solution for energy efficiency.

The evaporator: The coating on the Accelera® evaporator protects against corrosion and also allows quick water drainage for increased air flow and greater heat transfer and efficiency. Because the evaporator is self-cleaning no filter is required. A dual-path refrigerant flow provides cold climate performance in addition to warm climate performance.

The cold water inlet: Even the smallest thing is not overlooked. The cold water outlet is designed to prevent incoming cold water from cooling the hot water in the tank during a draw. This helps provide the greatest possible volume of hot water without using the booster heating element. This feature also increases heat pump efficiency by allowing a small cold water reservoir to remain in the very bottom of the tank.

Large tank + single heating element: A heat pump water heater’s recovery time is slower than a standard tank. But with the correct balance engineered between tank size and heat pump capacity, both efficiency and comfort are possible. The tank in an Accelera® 300 E is 80 gallons because we know that is an optimal size to satisfy average annual household hot water demand as much as possible via the heat pump. Similarly the Accelera® 220 E tank is 58 gallons because it is an optimal size for smaller households. With both models, if more hot water is needed, the single back-up element at the top of the tank near the outlet ensures comfort without sacrificing efficiency.

* Sound Pressure Level (SPL) measures the sound level (loudness) at a distance from the source. SPL varies depending on the acoustic environment and the accuracy of the measurement device. Sound Power Level (SWL) is an engineering measurement of the sound energy emitted by a source.