Hot Water Heater Replacement

[rpwx]

I own a 1976 Airstream International rear bath trailer which has a leaky hot water tank. The heater is a Bowen G-10-B. The height of the compartment entrance is 16 1/4", the width is 16". Depth is about 16" at the top, and curves around to about 20". I need to replace the heater.

I checked with some local dealers in my home town and all say that Atwood-Bowen no longer makes this unit.

Does anyone have any ideas?

Thanks.

Robert