Install tankless hot water

If you had a tank-type heater, and installed tankless, then you cannot use the same gas line pipe. You must have 1" gas line running to within 10' of tankless unit, and then 3/4" to tankless... and you cannot use flexible gas line.
You can use same hot and cold water pipes, but install service valves so you can delime the heat exchanger each year.
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html

Gene


Water Heater Timers Save Money

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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

Check for crossover: Where bad faucet cartridge or check valve lets cold enter hot pipe so hot never arrives at tap.
http://waterheatertimer.org/Crossover.html
If problem is not plumbing, then add a comment and describe which water heater you have, including approx age and what has been done so far.
Call local plumber to fix tank-type heater
If you have tankless, call manufacturer to get list of local technicians who work on these computers that heat water, or save money and tear it off wall and install tank-type heater today.
http://waterheatertimer.org/How-to-install-gas-water-heater.html
Gene

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

1) Add tempering tank to preheat incoming cold water.
http://waterheatertimer.org/Tempering-tank.html

2) Read product manual or call Bosch to make sure unit works with pre-heated incoming water. Some incoming water sensors will not trigger combustion is incoming water exceeds certain limit.

2a) Read product manual for required yearly/monthy maintenance.
Train wife to delime tankless yearly.

3) Install bigger gas meter.

4) Solve entire moneypit problem today for $325
http://waterheatertimer.org/How-to-install-gas-water-heater.html

5) Don't install tankless unless you have a lot of money and time for headaches.
Don't believe promotional literature. Tankless promotion is BS for average do-it-yourself folks who want to save a buck on water heating. Estimated yearly saving of $100 means Tankless do not save money long term. All costs are energy: Purchase price and installation negates several years saving up front. One repair will negate another 5-8 years energy savings. By then you need new unit.

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

Which type Richmond water heater?
Is this a tankless water heater or tank-type?

Tankless are notorious for 'cold water sandwich' under exact conditions you describe. You might need tankless with larger BTU burner.
Don't install a tankless.
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html

If you have tank-type water heater, then I suspect a clog in the hot water line, or single-handle faucet cartridge in show is going bad.
Same problems can contribute to tankless problems.
http://waterheatertimer.org/Low-hot-water-pressure.html

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

large water heater, turn p the themo stat to a higher setting ( watch for burns with young childern and older folks)

or the best install a tempering valve. this valve mixs hot water with cold water before it goes into the building.

Again if you have young ones or old people they can burn faster than any other group.the best is a larger heater for the DIY person.

Thanks Tom

All gas water heaters, tankless and tank-type, require cleaning burner and combustion parts.
Tankless manuals suggest once per year.
Tank-type once every 2-3 years.
Before calling service technician, open following links for Bosch troubleshooting resources:
http://waterheatertimer.org/Troubleshoot-Bosch-Tankless-water-heater.html
http://waterheatertimer.org/pdf/TWH-G1-13_Removing_and_cleaning_burners.pdf
Burners do not operate cleanly:
http://www.boschhotwater.com/HelpfulResources/TechnicalSupport/BoschAquaStarModels/125BOTechSupport/Troubleshoot/tabid/602/Default.aspx

Depends on what type of vent pipe it is. Usually a house of that age, a better vent pipe is needed. Also, tankless water heaters need a more direct path to exit exhaust then the tank water heaters. Chances are you will need to either just replace the type of pipe to one that can withstand higher heat and/or relocate the pipe exit to a more direct route outside the house.

Hi .. it appears that your house is very tight. From your description of leaving a window open , it seems that the gas heater is suffering from lack of make - up air. Forcing the gas exhaust up the chimney will not really resolve this. You will still be trying to move air out without any air input to replace it. You may be able to install a spring loaded vent so there will be an air exchange. Something like a dryer or bath vent hood installed backwards .. this might work. There does not need to be much of a make-up air supply .. something like a 1 inch hole might be enough. I have seen this problem in a neighbors house , he weather proofed his house so good, that his fireplace would not light, no draft !

Any thoughts, concerns?

Please Vote !

A draft inducer blower is used to create a proper draft in a chimney or exaust pipe from your water heater or furnace. In a high efficiency furnace or water heater, there is not enough heat expelled from the unit to the chimney to create a proper draft. The toxic carbon monoxide gas which is expelled through the chimney from your appliance is normally carried upward due to the rising hot air in the chimney. When appliances got more efficient (putting more heat into the water tank and less going out the chimney), manufacturers had to add this blower to help get the gases out the chimney since there wasn't enough hot air to create a draft.
Hope this helps.