Navien is the top-selling condensing tankless water heater brand in North America, and installing one correctly comes down to three things: sizing the gas line for the unit’s higher BTU draw, venting it to spec, and deciding whether the property needs built-in recirculation for faster hot water at distant fixtures. MQ Plumbing installs and services Navien tankless systems for homes across Mint Hill, Charlotte, and the surrounding metro.
Considering tankless, or already have one that needs service?
Call us and we'll walk through what your home's gas line and venting actually need.
Condensing vs. Non-Condensing — What Changes for Your Install
Navien’s condensing models reach up to 0.96 UEF efficiency and vent with PVC or CPVC, which is generally simpler and less expensive to route than the stainless steel venting non-condensing models require. Many models also include ComfortFlow, a built-in recirculation pump and buffer tank that delivers hot water faster and eliminates the “cold water sandwich” effect common with basic tankless setups — worth considering for larger homes or fixtures far from the unit. Which model fits your home depends on your existing gas line capacity, available venting path, and hot water demand — we assess all three before recommending a system, not after it’s already purchased.
Why Homeowners and Businesses Choose MQ Plumbing
- We evaluate whether your existing gas line can support the unit or needs upsizing, before installation day
- We install both condensing and non-condensing Navien series and vent each to its specific requirements
- We offer annual descaling service to protect the unit’s lifespan, especially given local water hardness
- Every installation gets a written estimate before work starts
- We’re licensed in both North Carolina and South Carolina