Living with Bob and Al

Sheri and Bob went downstairs to see if they could get the boiler running. Sheri knows that last year it was questionable whether Bob still knew what he was doing. Often in the past Bob had to add water to the tank by turning one of 2 knobs right next to the boiler, to keep it operating correctly. While starting the boiler up last night Sheri asked Bob if he remembered which knob he turns to add the water. "Al" scratched Bob's head and turned to the utility sink and said "Well this knob over here makes the water come out of the sink, we could do it that way." Sheri is thinking she better find a very cheap boiler guy... quickly.   :(