Thanks for your comment! I used Octane render for this, however 99% of the animation was AO mode (octane's biased mode -- there are two biased modes, Diffuse and AO, AO being the least realistic and by far fastest) because of a quick turn around needed. I believe the only part done with Octane's unbiased mode (PT for Path Tracing) was when the Tank Booster was by itself in the 360 spin and internal cut away.
The user still sets what temperature they want at each faucet in the house. Basically, the Tank Booster allows the water to be stored a higher temperature in the hot water heater and has a direct line to the cold water inlet from the house. It therefore mixes cold water INTO the extremely hot water in the tank to deliver a safe water temperature to the house faucets. Since the hot water in the water heater can be kept at a higher temperature and the cold is mixed in by the Tank Booster, MUCH less hot water is used. Therefore making the amount of hot water you have last much longer. Hope that makes sense, its kind of confusing at first, they had to explain to me several times!!!