My 337 does, so presumably, your 378 would too.
As for draining, on the outside of the heater, open the cover, near the bottom is a large hexagonal fastener. Remove that. Water will begin to drain. At the top of the unit, lift the pressure relief valve bail and the water will quickly escape the heater.
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2011 Georgetown 337
2009 HD FLHTCU
2007 HD FXSTC
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