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Free tool · no login

Size it right the first time.

Tank or tankless — get the right gallons, first-hour rating, GPM, and BTU from the home's real hot-water demand and incoming water temperature. Hand the customer a branded spec sheet.

The home

Answers update the sizing live.
Household
Fuel
Incoming water (coldest month)
Peak use — running at the same time
The busiest moment (e.g., two showers + the dishwasher). This drives tankless GPM.
Just the free stuff

This is a free tool we cooked up — it doesn't even scratch the surface of what ServiceRig does.

The real platform runs your whole shop: scheduling & dispatch, estimates, invoicing and payments, home-warranty two-payer billing, memberships, CRM & pipeline, RigShotz marketing, and RigAI as your receptionist, coach, and CFO — all in one. These little free tools are a taste. The rig is the meal.

See what ServiceRig really does → Tour the platform