Advice- Tankless Water Heater

[sandy2982]

I finally decided to replace the tank water heater I have with a tankless one. After some research, I narrowed the choices down to two "finalists": Takagi and Rinnai tankless water heaters. Rinnai seems to have some advantages, among them higher output (8.3gpm vs. Takagi's 6.9gmp) and, most important, lower kick-off flow (0.5gpm vs. Takagi's 0.75gmp). On the other hand Takagi seems more spread than Rinnai and also I could find a lot of information documentation for Takagi and almost none for Rinnai.I found some details here.
Need some advice from people who are using these water heaters.

 

[simond]

Rinnai are the largest gas heater company in the world. We have found their equipment to be reasonably robust and well made.

I haven't heard of the other company.