Technician was called out to the customers home today because she would like her wall-mounted faucet that she recently purchased installed along with two additional widespread faucets located in the guest house. Customer also purchased a shower cartridge and trim kit for the guest house master bathroom. Unfortunately, the trim kit did not fit. Neither did the cartridge. Technician inform customer that he would have to replace the shower valve system behind the wall. In order to do so technician will have to remove the water heater. Customer will order parts for the shower valve and technician will come back on a later date to do the installation.