Completed replacement of of old burned out electric tankless water heater for dog wash stations. Replaced failed 3/4 mixing valve as well. Installed prefilter to protect unit. Replace cartridge annually. Customer and staff have been instructed on use of this unit. No warranty. Commercial application We had a hard time finding a model that could keep up with the demand. It is possible that a 10 gal electric tank may be necessary to keep up with demand. This is a additional cost to customer.