I bought a rental property with a tankless WH. The WH serves two separate units.
When the upstairs tenant is showering the water will come on and will get hot but then go cold and even stop flowing water completely for a period of time combined with water hammer, then some back on but not be as hot.
Ok, now on top of that, a lot if not all of the fixtures in each unit are crossed with hot on the right and cold on the left. The shower valves are single handle and only work if you open them up a little Is a cross over occurring at a mixing valve? Does the crossover even explain the the reported symptoms? Wondering if that shower valve is only opened a little that it isnt drawing enough hot water and the unit drops below the minimum and shuts down. WOndering if the lines were crossed when the tankless unit was installed, would it even work if that were the case?
When the upstairs tenant is showering the water will come on and will get hot but then go cold and even stop flowing water completely for a period of time combined with water hammer, then some back on but not be as hot.
Ok, now on top of that, a lot if not all of the fixtures in each unit are crossed with hot on the right and cold on the left. The shower valves are single handle and only work if you open them up a little Is a cross over occurring at a mixing valve? Does the crossover even explain the the reported symptoms? Wondering if that shower valve is only opened a little that it isnt drawing enough hot water and the unit drops below the minimum and shuts down. WOndering if the lines were crossed when the tankless unit was installed, would it even work if that were the case?