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I believe its the 125 and 250 Bosch models. Check your owners guide, it may say something about rebuilding the water control valve every 2-5 years. Problem here is that the two set screws that hold the water control valve to the gas control valve rust solid and you're likely to damage the gas control valve if you try to drill them out, so you have to remove the gas and water valves as a unit and replace both, which is a $150-200 proposition. $15 in parts to rebuild the water control valve if its not frozen on.
Preemptively removing the two set screws and replacing them with stainless ones solves the freezing on problems.
Most tankless units require cleaning of an inlet water screen periodically and in areas of hard/high mineral inlet water a periodic de-scaling of the unit with a manufacturer provided descaling solution will extend the life considerably.
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