Gas Tankless Water Heaters

Gas tankless water heaters deliver continuous, on-demand hot water while cutting energy waste. Instead of storing gallons in a tank, they heat water as it flows, reducing standby losses and helping lower utility bills. Their compact, wall-mounted design frees up floor space, fits tight mechanical rooms, and suits both homes and light commercial applications. High-efficiency condensing models reach impressive UEF ratings and may qualify for utility rebates, offering faster payback and lower emissions.

Choosing the right gas tankless water heater starts with sizing. Match your peak flow rate (GPM) and required temperature rise based on your climate and fixtures. Colder inlet water or multiple simultaneous showers will require higher BTU input. Select natural gas or propane models to match your fuel source. Plan venting early: non‑condensing units typically use stainless steel venting, while condensing units often allow PVC/CPVC and require a condensate drain. If you dislike waiting for hot water at distant taps, consider a model with an integrated recirculation pump or add-on kit. In hard water areas, protect the heat exchanger with scale reduction media or a softener.

Quick buying checklist:
- Size for your peak GPM at the expected temperature rise
- Verify gas line sizing and available supply pressure
- Choose condensing for top efficiency; non‑condensing for lower upfront cost
- Confirm venting route, materials, and maximum equivalent lengths
- Consider built-in recirculation for faster hot water
- Review warranties (heat exchanger, parts, labor) and service networks
- Look for features like Wi‑Fi diagnostics, freeze protection, and low-NOx
- Install isolation valve kits for easier maintenance

Maintenance is straightforward: flush and descale annually (more often with hard water), clean inlet screens, inspect venting, and service condensate neutralizers on condensing units. With proper care and professional installation, many gas tankless water heaters offer long service life and reliable performance. Leading brands provide models for single-bath apartments up to large homes, helping you right-size capacity, improve comfort, and save space while maximizing efficiency.