Now we had the sink dimensions, we marked it out on the main counter and used a jigsaw to cut out the hole. We wanted to reuse the cut-out as an insert to fill in the hole when the sink was not in use, so there was no room for error on the cutting!
We made schematics of our proposed water system to understand the ins and outs of it. Then we set about sourcing the components.
We needed a water pump to move water around the system, and a water heater. Ideally neither demanding a lot of electricity.
Additionally the system needed; a 240v-12v converter for the water pump, a compression chamber (to give space for expanding hot water), one-way valves, pressure relief valve, and a drainage valve (at the lowest point to drain the system).