Tankless Water Heater Services Questions

Yes. Gas-fired tankless units are rated at sea level. At Denver’s elevation, combustion efficiency drops, reducing BTU output. Without an altitude correction adjustment, the unit cannot maintain its rated flow rate when demand is high. The technician applies the manufacturer’s correction factor during commissioning.

Yes. Gas line work and water heater replacements require a permit in Denver and most surrounding counties. Skipping the permit can void the manufacturer warranty and create complications when you sell the property. We identify the required permits upfront and include the fees in the written estimate.

A unit showing error codes or ignition faults can fail completely with no warning. In a Colorado winter, losing hot water also means losing a key line of freeze protection for supply pipes. A diagnostic call now is far less disruptive than an emergency replacement mid-winter.

The technician calculates your peak simultaneous hot water demand, the number of fixtures likely running at once, and selects a unit whose flow rate meets that load after the altitude correction factor is applied. Household size alone is not a reliable sizing method for tankless units.

Many tankless units draw more gas or electricity than the tank they replace. The technician checks your existing supply during the assessment. If an upgrade is needed, it is scoped and priced in the written estimate before any work is approved.