The problem is expansion when hot and contraction when cold of the water cylinder.
Truma water heater not working on gas.
If they seem to be malfunctioning as well check the main regulator pressure.
If you are lacking heat by searching the web i found that there are several problems that seem to afflict these heaters 1 relays not working.
The problem is reduced if the temperature constant.
A comfortable water temperature at the faucet or shower is achieved by mixing with cold water.
The truma aquago basic does not have frost protection and should not be used or filled with water when there is a danger of freezing.
More often than not hot water systems stop working because of a fault in the gas or power supply.
No i don t fix caravan heaters but to help you here is how i fixed mine.
My model has settings at 500w 1kw and 2kw.
If your hws runs on gas your other gas powered appliances can give you a clue as to whether gas is reaching your system.
Apparently the manufacturers know the problem and are endeavoring to fix it.
Truma corp 2800 harman dr elkhart in 46514 usa.
1 855 558 7862 fax.
Check for gas or electrical supply issues.