SPS 320

Special Power Supplies For Gas Water Heaters


Backup Power for Gas Water Heaters:

This special backup power supply for gas heaters and gas water heaters is ideal for locations with poor power quality or regular power cuts. Like the uninterruptible power supplies (UPS) used for computer and alarm systems, it automatically switches to a rechargeable maintenance-free battery whenever there is a power blackout or brownout.

Why do I need backup power for gas systems? Gas heaters and gas water heaters often require electrical power to provide the spark for gas ignition, as well as running an electronic controller and small internal fan. In the event of a total power failure (blackout), as there is no electrical power available to ignite the gas, there simply will be no heat or hot water. The Helios Power Solutions SPS 320, apart from cleaning the power, charges its own batteries, keeping them ready for the next power failure (blackout or brownout event).

Operating Instructions

  • This unit must be installed in a dry environment, so an electrician may be required to instal a new power connection inside the building, or a weather-proof enclosure which needs to be larger enough to allow for cooling.
  • The back up time depends on the type of controller installed but is typically as stated in the SPS320 brochure. The controllers only require power when the gas is flowing, that is when the hot water is being used. When there is a power failure these units will also switch off automatically after 1 hour if there is no load. During a power cut battery life can be further extended by switching the SPS320 off at the wall when you have finished running the hot water and switching it back on again when required. If the anti-frost system operates in the water heater, the battery will discharge faster. The battery will be automatically be recharged once the power returns.
  • The SPS320 may be used in conjunction with a generator so that it supplies power until a generator
    is connected, at which point the generator power will be supplied to the gas appliance and also recharge the SPS320’s battery, if desired. Please ensure that the maximum output voltage of the generator does not exceed 276Vac.
  • Typical battery life is about 3-5 years. It is recommended that the SPS320 be tested every 12 months to check that the operation is still satisfactory by turning the input power off and running the hot water.


Model Batteries Feautures
SPS 320-800 contains standard battery
SPS 320-1200 contains long-run battery
Typical back up time
Model Applications Time
SPS 320-800 Continuous Flow Gas Water Heaters Residential Use 40 minutes
SPS 320-1200 Continuous Flow Gas Water Heaters Residential Use 90 minutes
SPS 320-800 Continuous Flow Gas Water Heaters Commercial/Residential Use 30 minutes
SPS 320-1200 Continuous Flow Gas Water Heaters Commercial/Residential Use 60 minutes
SPS 320-800 Gas Condensing Water Heaters Commercial/Residential Use 25 minutes
SPS 320-1200 Gas Condensing Water Heaters Commercial/Residential Use 45 minutes
SPS 320-800 Gas Fireplaces 20 minutes
SPS 320-1200 Gas Fireplaces 40 minutes
 These times are for continuous fan or water heating operation, but thermostat operation of the fan or intermittent water use may lengthen this


Input Voltage 230V
Output Voltage 230V
Alarms Power Failure
Battery Low
Dimensions (mm) 90W x 192H x 232D  SPS 320-800
97W x 275H x 315D SPS 320-1200
Environment The SPS 320 must be installed in a ventilated weatherproof location with its front panel
Warranty 12 months
New Rack Mount DC Power Supply For Base Station Repeaters 2020