Published by All Systems Pros · Updated October 12, 2026
The short version
A tankless heater can supply continuing hot water within its flow capacity and avoids storing a full tank. Conversion work may add cost. Compare the actual installation scope, household demand, operating costs, and expected maintenance for either option.
Where tankless genuinely wins
Tankless may be worth evaluating when:
- Your household runs out of stored hot water, and a correctly sized tankless model can meet the required simultaneous flow and temperature rise
- 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)
Tankless sizing uses simultaneous hot-water flow and the required temperature rise. For a gas model, the installer evaluates fuel supply and approved venting; condensing units also need suitable condensate handling. Required upgrades vary by site. The approved tank installation example is $4,250–$5,200, subject to the written scope. Request a project-specific estimate for tankless work. Free estimates apply to installations and replacements. Synchrony financing is available on qualifying work, subject to approval and terms.
Sources and further reading
About All Systems Pros
All Systems Pros is a plumbing service company based in Monrovia, CA. The company lists Rheem ProPartner, A. O. Smith Certified Contractor, and Raypak credentials. These general guides help explain plumbing topics; equipment instructions and project requirements must be checked for the specific property.
