By the All Systems Pros service team · Updated July 20, 2026
The short version
A tank heater costs less up front and is simpler to replace like-for-like. A tankless unit costs more to install — especially the first time, when gas and venting upgrades come into play — but delivers endless hot water, cuts standby losses, frees up floor space, and typically lasts 20+ years against a tank's 8–12.
Where tankless genuinely wins
Tankless is the stronger long-term play when:
- Your household regularly runs out of hot water (back-to-back showers, big soaking tub, laundry + dishes at once)
- You plan to stay in the home long enough to bank the efficiency savings
- Floor space matters — wall-mounted units free up a closet or garage corner
- You're replacing a unit anyway and the gas/venting upgrades are already needed
Where a tank still makes sense
If the budget is tight, the household's hot-water demand is modest, or the home's gas service would need an expensive upgrade to feed a tankless burner, a quality tank unit installed correctly is an honest, economical answer. We'll tell you when that's the case — not every home should convert.
What a real conversion involves (and costs)
A proper tankless conversion is sized to your actual demand (typically 2–10 gallons per minute) and usually includes a gas line upgrade, correct venting, a condensate drain, and service valves. A typical tankless installation runs $4,200–$8,500 depending on the unit and required upgrades; a typical tank installation runs $4,250–$5,200. Financing is available through Synchrony on qualifying installations — and the estimate is free either way.
About the author
Written and reviewed by the All Systems Pros service team — licensed plumbers holding Rheem ProPartner, A. O. Smith, and Raypak factory certifications, with 30+ years of combined service experience, based in Monrovia, CA.
