Observed arrival · 2026-10-20
Tanklessly: size a heater for winter water
A tankless-water-heater catalog and sizing planner that compares gas and electric units against fixture demand and winter inlet temperature.
- For
- Homeowners sizing a tankless water-heater replacement
- Worth noticing
- The homepage reports 489 products across 124 brands; some listings still show no estimated flow at the selected temperature rise.
Field notes
The planner lets visitors set simultaneous showers, sinks or appliances, winter inlet-water temperature, and fuel; its flow check then compares listed heaters at the resulting temperature rise. The catalog spans gas, electric, heat-pump, point-of-use, descaling, and venting categories, and the homepage reports 489 products across 124 brands. Some visible product entries still show a dash instead of an estimated flow at the chosen rise, so not every listing appears equally informative.
Observed signals
Read the marks
Editorial observations of this landing page, not a rating.
One card from the complete issue