Why is the Solar shower not heating up after filling the tank 48 hours?

The Solar Shower not heating up after 48 hours could be due to the following reasons: Heat Loss at Night: The shower will lose its heat within a couple of hours after the sun goes down, so even if it has been left in the sun for an extended period, it will not retain the warmth overnight. Purging Issue: If the shower is not fully purged correctly, it won't heat up efficiently. Ensure that it has been purged according to the manufacturer's instructions to allow it to heat up properly. These factors must be considered to ensure that the Solar Shower operates as intended. If there are further issues, referring to the user manual or contacting the manufacturer may be necessary.