Is this suitable for heating an entire home?A.
That depends on the size of your home. However, 7.5 gallons is adequate for heating a home in most circumstances.
What is the minimum water temperature? Is there a way to extend the vertical rise an additional 3 inches?A.
The Rinnai RL75iLP has a minimum temperature of 98 degrees F. There is a telescoping vent length that should handle your vertical rise. The pipe length part number is 224054 and telescopes from 2.2 inches to 12 inches.
Will the 6"condensation collar give me 3 additional inches?A.
The Rinnai RL75iLP condensation collar is built into the device and is included in the product height already.
Can this water heater be installed using existing through-the-roof venting?A.
The Rinnai RL75iLP uses direct vent type venting. If your existing venting is a direct vent type system, assuming all other necessary conditions are met, you will be able to use your existing venting.
Click the link labeled "Owners Manual" or "Installation Guide" below the Product Details on this page for additional details regarding the installation of this product.