Hottap is activated by water pressure. Before you have water flowing, or if you don't have enough flow (or pressure), nothing will happen. As in, HOTTAP won't make any sounds and the LED won't light up. Note: You can troubleshoot this issue by pressing and holding the 'Joolca' Icon on the LED screen and observing if the water flow error icon illuminates - read more Troubleshooting HOTTAP v2
As the water flows through HOTTAP, a sensor picks up the water flow rate and opens a gas solenoid valve, which allows the gas to flow into the burners and ignite. At this point, you'll hear a loud clunk (solenoid opening) and fast ticking (the ignitor).
This whole ignition system is powered by the two d-cell batteries. They are also what power up the LED screen. Because juice is only drawn when HOTTAP is active (and not much power is taken anyway) they last for quite a while. Normally at least 6 months, but it depends on your usage.
Once the HOTTAP is active, you can look through the slits above the control dials to see the flame. Adjusting the flame toggle will increase or decrease the size of the flame and thus the heat output. Adjusting your water will either reduce or increase the speed at which the water flows through the heat exchanged. Faster flow = less time to absorb heat, therefore less hot water. Slower flow, hotter water.
If you're using our 12V pump, that runs off a separate 12V power supply, namely a cigarette socket or any other 12V supply that you might have. Our pumps have a sensor which can tell when the water flow has been turned on / off.
What this means for you is that you can have your shower or faucet all set up, and by simply flicking the water flow on, the whole system will work automatically to start the water flow and heat the water up. When you're done, that same switch will shut everything off.