Plumbing contractor license number appears in screen text somewhere.
[ZACK appears onscreen with 3 TECHS]

TECH 1:  When the bottom rusts out’a your water heater,
TECH 2:  [nodding his head up and down with BIG EYES] 
                     all that water floods the house!
TECH 3:  [slowly shaking his head “no” in disgust] 
                 and the supply line keeps pumping more water in.
ZACK:    So Kenny and me wrote this song for you. 

[ZACK and the 3 TECHS dance happily to our 15-second tune of the little kids singing.]
As each line is sung, screen text appears to let the viewer read the lyrics as ZACK and the TECHS do their comic dance.

Turn off the gas at your broken water heater.
Turn off the ‘lectric at your ‘lectric water heater.
When your water heater bursts, turn off the gas-n-‘lectric first,
Then turn off the water at your busted water heater.

ZACK:   Or you could replace that water heater BEFORE it goes bad. Personally, I think that’s your better option.

[On “Personally,” Zack starts nodding his head “yes.”]
            Goettl Logo appears and we hear Ken’s voice say “Gee-Oh-E-TT-L”