In reply to Brian Hinton 🐧 Russell Heimlich @kingkool68 • January 21, 2020 9:29 am @MrBrianHinton @davatron5000 The water? Yes. It happens rather fast for the sinks closer to the tankless water heater. The master shower is the farthest away and takes a good 30 seconds to heat up. Same problem with a tank water heater though.