Our genius-plumbers are certified to mount a variety of Water Heater systems, from different brand names to household or commercial. Setting up a water heater costs $703 and $1,750+, or an average of $1,000+, including the unit and labor. Tankless heating units cost concerning $900 to $3,500. Water heaters cost $350 to $3,000+ for the unit alone while plumber labor runs $40 to $200 per hr. The National Average is $1,150. The regular Range: $700 - $1,680. Low End - High End: $337 - $9,890.