Hydronic Pipe & GPM Calculator
Turn a heating or cooling load and a design delta-T into a flow rate, then size the copper for it – with the velocity and friction head shown for every leg.
Delta-T is the assumption that drives everything downstream. Widen it and the flow drops, the pipe gets smaller and the pump gets cheaper; narrow it and every one of those moves reverses.
Need the whole set drawn and stamped? Ask for a fixed quote, or see the other calculators.
Complete MEP permit set built to get approved.
Every mechanical, electrical, plumbing, and fire sheet your reviewer needs — a fixed quote in 24 business hours, first sets in as few as 5 working days, and city comments answered until your permit is issued.