The T-H3-DV-LP from Takagi is an Indoor Tankless Water Heater, Propane, 199K BTU. 

Durable Heat Exchanger:

• Primary Heat Exchanger is constructed of HRS35 Commercial-Grade Copper
• Secondary Heat Exchanger is made of Type 316L Stainless Steel

Easy-Link Up to 4 Units:

• With no additional parts or accessories needed

Safety:

• Air-Fuel Ratio (AFR) Sensor
• Exhaust & Water Temperature Safety Control
• Overheat Cut-Off Fuse
• Power Direct Vent Design:
• Exhaust, 3" PVC Venting up to 70 Feet or 4" PVC Venting up to 100 Feet
• Provides flexible venting with PVC, CPVC, or ABS Pipe for Intake and Exhaust (solid core only). 
• Canadian Installations Require ULCS636 Listed PVC or CPVC Pipe for Venting.
• Category IV Stainless Steel venting can also be used

Features:

• Ultra-Low NOx Condensing Technology
• Continuous Maximum Flow Rates Up to 10.0 GPM
• Easy-Link Up to 4 Units
• Energy Star Qualified
• Can be used in both Residential and Commercial applications
• Electronic Ignition - No Pilot Light
• Internal Freeze-Protection System
• Includes a Built in Temperature Controller and Advanced Diagnostic to Simplify Troubleshooting
• Factory-Installed Power Cord
• Multi-Link Up to 20 Units
• Complies With Lead Free Standards
• Internal Freeze Protection System
   

Technical Specifications:

• LPG Input Min. 13,000BTU/h Max. 199,000BTU/h
• Gas Connection 3/4" NPT
• Water Connection 3/4" NPT
• LP Gas Pressure Inlet Min. 8.0"WC Max. 14.0"WC
• Weight 59 lbs
• Dimensions 22.4" x 17.7" x 10.7"
• Ignition Electronic Ignition
• Electrical Supply AC 120V (60 Hz)
• Water Pressure Min. 15psi Max. 150psi
• T-H3DV Manifold Pressure Natural: 2.95" WC
• Propane: 3.3" WC.