Question about Bosch Water Heaters
Your contractor understand the market there, but problems are mirrored in US also.
As evidenced by fixya.
1) Tankless cannot be exposed to more than 11 grains hard water, and require minimum water flow and water pressure or sensors will shut down burner or element.
2) For example, tankless might turn on with 2/3 gallon-per-minute water flow, but then another faucet is turned on so pressure and water flow drop, and tankless turns off. Or neighbor's water usage causes decrease in line flow, so tankless turns off. This is called 'cold water sandwich.'
3) If problem is water pressure, you can add in-line pressure tank, but root causes vary widely with more than one factor as suspect.
4) Also incoming water temperature can be a factor, along with temperature setting of unit. Most tankless are preset to 120 degrees F, which is modest temperature and certainly not very high. If tankless cannot raise temperature of incoming water fast enough, then tankless turns off. Of course water flow continues, so you get dose of cold water.
You can add simple120Volt 30 gallon tank-type electric heater as a tempering tank that pre-heats water either passively or actively: http://waterheatertimer.org/Tempering-tank.html
5) Both internal and external factors affect tankless, with bottom line that these high-tech devices are not do-it-yourself repair for most people.
6) Install DIY tank-type gas water heater and avoid the whole headache
7) In my opinion, the genius of tankless is not that they save money or energy. Because they don't.
The genius is marketing that targets a certain affluent who believe tankless save money and energy.
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Posted on Mar 23, 2011
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Posted on Jan 02, 2017
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