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if it is a truma heater there is a slight chance of the non return valve leaking back into the barrel. if so pressure will take longer to maintain.

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if it is feeding back after the heater has reached its full heat then the pipes on the pump outside will be warm.this is a good indication of feed back.check outside for leaks too when the pump is running.check yellow drain tap is fully closed. 

I would be having the same problem with the cold supply too which I'm not.

no only applies to the hot supply.the only other thing i can think of if you have hard water is it is blocked by scale,filling overnight with white wine vinegar and water will cure this.

I initially thought of the non return valve not operating correctly but Truma dismissed this as being the problem but if it solved your problem then it's probably worth replacing it to see if it does cure the problem.

Michael:  Can you tell me what ratio of white wine vinegar do you need to add to a 40 ltr. Aquaroll of cold water prior to pumping into the water system as I may try this first?