The advice given by unlicensed DIY'rs on this thread or any thread on the internet PERTAINING to tankless water heaters is solely based on lack of experience, or limited experience given a short exposure to said product.
Their experience is limited, and when the purchase of the product was made, a crucial requirement of such product was immediately ignored and therefore DESTROYS THE MFG. WARRANTY, EXPRESSED OR IMPLIED.
THIS IMPORTANT INFORMATION WILL BE FOUND AT YOUR PLUMBING DIVISION OF THE STATE YOU ARE RESIDING IN, ALONG WITH MFG. REQUIREMENT
It clearly states that their product "Must be installed by a licensed plumbing contractor, and adhere to all local and national codes"
The installer of the RINNAI tankless by gregsauls on this forum has violated numerous plumbing codes by assuming the responsibility of installing a device that was meant to only be installed by someone who is properly and formerly trained to handle the task at hand.
THERE HAS BEEN NO MENTION OF A PLUMBING INSPECTION
THERE HAS BEEN NO MENTION OF ANY TESTING TO PROVE THERE ARE CORRECT PLUMBING REQUIREMENTS TO ACCEPT THIS DEVICE IN THIS STRUCTURE.
The facts are that no third party has without reward determined if this device was safely installed in this structure without the required and necessary permits, which is done solely to protect the inhabitants in the structure along with surrounding community.
THESE DEVICES ARE A WATER HEATING DEVICE THAT IF NOT INSTALLED CORRECTLY CAN POSE SERIOUS HEALTH RISKS, AND TO DO SO YOU HOLD YOURSELF PERSONALLY LIABLE FOR ANY DEATH, DESTRUCTION TO PERSONAL PROPERTY AND HARM TO OTHERS.
Installing plumbing devices such as tankless water heaters, tank water heaters should be done in accordance to comply with state and local codes, local authority.
ANY advice given on these such matters without such credentials is a potential risk given there's no culpability in the statements, and that the repercussions can be substantial.
This has been a public service announcement from someone that has installed plumbing more than once, and had to blog it and show it off because they are special.
That is all, and ladiesman,
Lay off the cogniac, it's cramping your ability to comprehend logic.