Why Tankless Water Heater Installation Is Worth Getting Right the First Time Tankless water heater installation is one of the most impactful upgrades you can make to your Utah home — but only if it's done correctly. Here's a quick overview of what the process involves: Size the unit — Calculate your home's peak flow rate (GPM) and required temperature rise (Delta T) based on Utah's cold groundwater temperatures. Choose gas or electric — Gas models need a 3/4" to 1" gas line a