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The Stiebel Eltron Accelera 300 has been discontinued.
Please call us for a suitable alternate product.

(800) 865-5931

Monday - Friday

8:30 AM - 5:00 PM Central

The beauty of heat pump water heating technology is that the amount of electrical energy needed to create hot water is greatly reduced compared to a conventional electric tank type water heater. The Accelera's compressor and fan consume only 1kWh of electricity to generate the heat equivalent of 3 – 5kWh. The efficiency of the unit goes up with increasing ambient air temperatures. This ground breaking efficiency redefines what a water heater is capable of.

Heat pumps have been around for decades, but a heat pump water heater is a new concept. The Accelera® 300 works like an air conditioner but instead of dumping the heat outdoors, it puts it into the water.

In a warm climate the unit can either be placed in the garage where it takes heat from the ambient air, or inside the house where it helps with the air conditioning load. In a cooler climate, the unit is typically placed in the basement where it also acts as a dehumidifier. You get hot water at a discount and a dry basement as well.

If the heat pump that is built into the unit cannot keep up with the hot water demand, an electric backup element with 1.7 kW loading will automatically activate.

Standard Features

  • 2.5 Energy Factor
  • Reduces hot water costs by up to 80%
  • Cools and dehumidifies the air around it
  • Low stand-by losses through good insulation
  • 80 gallon storage capacity
  • 10 year warranty

Coefficiency of Performance

Coefficient of Performance is the efficiency ratio of the amount of heating or cooling provided by a heating or cooling unit to the energy consumed by the system. The higher the Coefficient of Performance the more efficient the system. Resistance electrical heating (such as electric baseboards) for example has a Coefficient of Performance of 1.0

Coefficiency of Performance
3.18 COP
Nominal CFM

The amount of air that can be moved by the fan, measured in cubic feet per minute (cfm).

Nominal CFM
Max Water Temp (F/C)
140 / 60
Water Capacity
80 Gallons
Maximum Fuse/Breaker

The maximum capacity breaker that the unit can be connected to (This is the best option for consistent performance)

Maximum Fuse/Breaker
15 Amps
Energy Factor
Max Water Pressure
87 PSI
Operating Temperature Range
42 to 108 °F
Connection Diameter
3/4 Inches
Weight (Empty)
286 lbs
Weight (Filled with Water)
952 lbs
26 Inches
73 4/5 Inches
240 Volts
60 Hz
Voltage Phase

In 2002 Alpine Home Air Products became the first company to sell heating, air conditioning and indoor air-quality products online. We have proudly served hundreds of thousands of customers, helping them save time and money by buying their products direct.