Bosch AquaStar 125B LP Installation And Operating Instructions Manual page 12

moisture or corrosion at the joint of the water valve and
the gas valve is a sign that the water valve assembly
components need to be replaced immediately
All manuals and user guides at all-guides.com
It is extremely important for a tankless
instantaneous water heater to have the right size
gas line to obtain the correct gas pressure
Any sign of
add any flow restrictor to the shower head.
Do not