Discontinued Product. ATWOOD HWS CIRCUIT BOARD Part No: MPD93307Â Â 2021-82 Rev D Replacement circuit board for Atwood 23 litre GAS ONLY hot water system. Atwood circuit board to suit the Australian imported model (not supplied directly by Dometic Australia). Electronic water heater PC board with 6 pin electrode connection. Fits ony imported GAS ONLY Atwood units and is NOT suitabe for the Gas/240Volt units.