Sine Wave Inverters for Off-Grid Tankless Installations

For Bosch tankless water heater customers who are off-grid and whose water heaters require a 120VAC connection for the electronic ignition or the power vent, we sometimes get questions about Sine Wave Inverters.

As long as the sine wave is an Uninterupted Power Supply (UPS) at 120VAC constant then the heater should be fine. All of the heaters that require 120VAC should work fine.

If a battery back up system is to provide power to a Bosch tankless water heater in case of a power outage, the back up battery system must be able to produce a pure sine-wave voltage output to the heater. APC (American Power Conversion Corporation) is one of the companies that offer a line of battery back up systems that produce a pure sine-wave voltage called Smart UPS (Uninterrupted Power Supply).

The APC Smart UPS 750VA or above (SUA750) will produce a pure sine-wave voltage output that is compatible with the Bosch tankless water heaters.

Here are a few other manufacturers and the model numbers of UPS battery back up systems that produce a pure sine wave voltage output:

• Powerware 5115 (500VA or above)
• Tripp Lite SU1000XL
• Cyberpower PR1500
• Belkin F6C100
• MGE Pulsar EX700RT