This lead free stainless steelided gas water heater supply line starts with an extruded core of PVC tubing. The core is then over .ided with polyester yarn and another layer of PVC material..Continuous Water. Continuous water, shower after shower! The more water you need, the more you need a Vertex water heater…t Rod units are proven for safe, quiet operation while providing generous supplies of water. Your propane system remains intact for those times when hookups are not available..When you buy a new water heater, it’s important to gauge your water needs accurately so that you get a heater large enough to supply them. Having done that, you can install the heater yourself, but homeowners who do sometimes make mistakes, and some of them can cause damage to the heater or even personal .