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