4 tubes from single lever hot water dispenser
I purchased this unit with the single lever hot water dispenser, and without the filter as I will be using water from my reverse osmosis as the filter. Upon opening the dispenser package, I see 4 tubes coming out of the bottom of the dispenser:
1) all copper
2) copper with opaque plastic tube attached
3) all (opaque) plastic tube
4) blue plastic tube with snap on connector
Breaking down the system by function, there is:
a) cold water input
b) hot water output
c) vent
Logic would cause one to expect three nipples on the tank and there are. One would expect the (a) nipple to connect directly to the cold water source, and the (b) nipple to connect to the hot water dispenser.
So:
why are there 4 tubes coming from the dispenser?
what is (1) above used for?
what is (2) above used for?
is the blue tube cold water input (cold normally is marked blue)?
Finally, is there any issue using the output from my reverse osmosis as the input for the Insinkerator water heater
The instructions are no help in answering these questions, so thanks for any clarification you can provide.