Can we draw the following hypothesis from the context? 

Context:

How to change a dip tube<br>Check when your water heater was manufactured. Nearly all gas and electric water heaters manufactured between 1993 and 1997 were installed with defective dip tubes. The dip tubes were made of a material that quickly degraded and disintegrated, causing dip tube failure.

Hypothesis: gas and electric water heaters have been used by arnold
It's impossible to say