NO HOT WATER ON OTHER SIDE OF HOUSE

Do you have consistent hot water from other taps in the house? If not, try turning up the thermostat setting to a higher temperature on the hot water heater. If it is hot and then the temperature drops, you may not be producing enough hot water and may have electric element burned out in your water heater, if indeed it it electric.

the last thing to check if your hot water is constant and strong at other taps is to replace your temperature regulating valve on your tub.

Could be. Location of the pipes has to start from the farthest part of the house to the place where the heater is at.

In theory it sounds good, but I don't think it would function properly. Most folks install a low boy 20 or 25 gallon water heater near the master bath and use the home's cold water feed as the supply line. That way, the water for the master bath alone, will always remain hot.Of course this would involve some plumbing modifications.

Of course, the other less expensive solution, would be to insulate the hot water pipe(s) feeding the master bath, from the existing water heater. That way, there would be no heat loss in the pipe(s) so the water in the pipe would remain warm to hot all the time.

Either of the above solutions should heat things up for your customer.

Try running the hot water in the sink while you have the shower. If the water in the shower stays hot, then the problem is not enough flow through the water heater to keep the heater running. I am guessing that the master bath is further away from the water heater than the guest bath. If not I would check the shower nozzle in the master bath to see if it is clogged a bit or if it is a water saver nozzle because this will slow down the water volume and then cause the water heater to shut off the heat.

It sounds like you have a plumbing cross over or a poor install. Check boschhotwater.com to find a service technician and have a Bosch service provider look at it.

probably already solved this but yes, you can put a heater on any bathtub that has water jets.

It could be back flowing into the hot water heater tank which is not full because of the leak. Even though the valve is closed on the cold water entry side, there is probably no valve on the exit side. That is how it is returning to the tank.

they have it installed wrong it is pulling from the wrong side, it is supposed to pull ot water up to the fixture but then if it stays hot on the cold side they are backwards

You may need a circulating pump but I can't explain why it was fine before and not now. What I would do is turn the supply off to the water heater along with the power, remove the outlet supply. Open all hot side faucets in the home, using compressed air blow through the pipes if the air comes back at you, then there is a blockage before the hot manifold. If air moves, shut one faucet off at a time to try and determine where the culprit is. I don't know what else to tell you other than that. If air moves through the faucet every time, then you may want to put a circulating pump on. The only other expination is that when they repaired the pipe, some debris or eccess solder is blocking the hot supply. I have seen rocks in units as well. Because of the fix, you may want to take apart each faucet in the house and using a flashlight, look in the hot supply side to see if you can find any debris in those as well. Its not unusual after a repair, to have debris caught in them. Hopefull this helps.

There is something in the line or in the faucet.Are your pipes going to the faucet black iron or galvinze.Some of the pipe will rust up and stop a full flow of water.But I would check the faucet first to see if the screw is loose or somethng in it.