Takes too long for hot water.

Tankless promotion is certainly slick and inviting...

-Tankless gas save about $100 per year vrs pre-april-2015 gas water heater for 'average family of 4.'
-New energy standards will reduce the expected savings to $70/ per year.

-Tankless electric cost about $100 more per year to operate than ordinary electric water heater for 'average family of 4'

-Do-it-yourself repairs are generally not possible with tankless.
-Tankless gas require larger vent and larger gas line, and a condensate drain.
-Whole-house Tankless electric will probably require a new electric service panel
-Tankless require yearly deliming/ descaling of heat exchanger... and heat exchanger will lose efficiency over time because of scale... even if unit is delimed each year.
-Electronic controls are vulnerable to surge
-Only the alloy heat exchanger has long-term warranty, but otherwise the warranty is same as typical tank heater
-Tankless cannot be exposed to more than 11 grains hard water or parts can fail within 2-3 years
-Tankless might not be able to keep up with higher temperature setting needed to fill very large tub (or any bathtub) if incoming water is too cold due to winter conditions. Etc.

Example Rheem tankless resource:
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html
http://waterheatertimer.org/pro-n-con-for-tankless-water-heater.html

Example installation for tankless electric
http://waterheatertimer.org/How-to-wire-Tankless-electric-water-heater.html

Gene


Water Heater Timers Save Money

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

Contact Rinna
Some water heaters allows changeover by installing new chipboard or changing dip switches... some do not.
Propane burns much hotter with higher pressure than natural gas
Gene

Water Heater Timers Save Money

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

http://waterheatertimer.org/How-to-install-electric-water-heater.html
http://waterheatertimer.org/How-to-install-gas-water-heater.html

Gene
h

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

Tankless computers are usually not repairable by homeowner unless you replace the thing with tank type heater and start over.
http://waterheatertimer.org/How-to-install-gas-water-heater.html
http://waterheatertimer.org/images/Lady-with-red-hair-error-11-429b.jpg

Call qualified service technician to repair tankless

Gene

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

The rinnai is a computer that heats water. It is not ordinary water heater most people are familiar with, and repairs are not do-it-yourself, requiring a trained technician qualified in that brand who can diagnose both computer and water heater problems and plumbing problems.
Call rinnai for recommended local technician. Click on support tab. Note their webpage is very short on repair details, unlike companies that sell tank-type heaters... because tankless units are not do-it-yourself.
http://www.rinnai.us/tankless-water-heater
Problem might be simple blown glass fuse on circuit board or complete failure of computer and sensors.
Here is page written for Rheem tankless, that explains general complexity of tankless computers, and showing required maintenance, such as deliming each year:
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html
To save problems with tankless computers plus anticipated expense of maintenance and repairs, I recommend homeowner install tank-type gas water heater:
http://waterheatertimer.org/How-to-install-gas-water-heater.html
Also install one-time-use whole house surge protector, and install grounding rods to prevent further damage... lightning frequently likes the same places over and again:
http://waterheatertimer.org/How-to-wire-Whole-house-surge-protector.html
Gene
h

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

The electric water heaters have replaced the traditional of water heating. The advanced features and the latest technologies of water heater have made it so easy for everyone. Find the best electric water heater on the market today. Read electric water heater reviews and comments from experts. Almost each product is manually reviewed and tested.
Electric Water Heater List Reviews waterheaterlist com

Not sure which surge protector you have.
Copy following links for whole house surge that might give some help.
http://waterheatertimer.org/How-to-wire-Whole-house-surge-protector.html
http://waterheatertimer.org/How-to-wire-Tankless-electric-water-heater.html

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

check to see if you have a blocked line on the hot water side

blockage at pilot ,gas valve faulty ,if you have a changeover valve fault could be there