Water Heater Gas Fired - Model 501 can be used for on demand hot water. This gas fired hot box fires 500,000 BTU into a spiral design heat exchanger with schedule 40 steel pipe. The fuel source can be natural or propane gas. There are many options that can be added to Alkota water heaters to meet your needs. With the support of your local Alkota dealer we can find the correct solution for you. Hot water heaters from Alkota feature our industry leading hydro insulated coil. The hydro insulated coil provides user safety and well as money saving performance. Alkota hot water heaters protect you with a 7-year coil warranty. Water heaters have many different applications we would love to talk about new ideas and put an Alkota water heater to work for you. Multiple voltages available please inquire.