I purchased this unit to replace a previous under sink hot water heater that expired after 10 years. The new unit was easily installed using the same fittings I had already installed prior. I did not use the supplied faucet as I already had a hot / cold water dispenser installed. The new unit was very similar to the old unit except that some parts were plastic rather than metal but it doesn't seem to be critical. I also don't use the filter as I have a 2 stage under the counter filter system.