Arrived at location for no hot water. Diagnosed issue to water adjustment valves. Valves are malfunctioning and not allowing water to pass through heaters. This is causing no water at all on fixtures calling for hot water. Replacement of these valves will resolve no water / no hot water issue unless another underlying issue is present which we can determine once these valves are installed and water flow is restored. I will email my supplier to get the ball rolling on acquiring these valves sooner. My supplier is closed till Monday so an answer may not come until then on an eta. Will keep you posted on timeframe