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Leaking 6gal inseries hotwater heater

Because the main hot water heater is 40 ft away from the bath rooms, I installed an 'inline' 6 gal supplemetary hot water heater. Six years later now, that 6 gal device leaks a cupful of water per shower from the safety valve. I changed the valve and even tried turning down the temperature of the main 50 gal hot water heater.
Should I install an expansion tank at the feed pipe to the 6 gal device (coming from the main water heater HOT output)? I notice there is such an expansion tank at the feed to the main hot water heater.

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