We first became aware of the tank less water heater technology in the early 1980s. As with all products we sell, we chose to test this concept before offering it to our customers. Being the owner and the company's favorite guinea pig, we put one in my home. At the time I had 4 children in the home and occasionally ran out of hot water.
I found that this device had advantages and disadvantages. The biggest advantage was, that, unless it was broken down, we never ran out of hot water. While one disadvantage was that it took a little longer to get hot water each time, the most significant disadvantage was that it was not nearly as reliable as a normal water heater. I am sad to admit, that we did sell a few to our customers before concluding that they caused more problems than they were worth. On inherent problem with Tankless Water Heaters is that they MUST be cleaned or descaled at least annually. Since the basic concept has not changed in 30 years and we have seen several installed by others during that period, our opinion has not yet changed. We do still sell and install these units once we feel that we have completely explained all of the advantages and other options. We service and sell Navien, Bosch, Rinnai, Noritz, Takagi, Rheem and others.
Our favorite approach to water heating is a method of using 2 water heaters piped together. We heat the first one for free with waste heat from your air conditioner, or with high COP heat from your HEAT PUMP or GEOTHERMAL SYSTEM. We then send this water that is often heated all the way to 130 degrees for free into a conventional tank for finishing and more storage.
Our experience is that this method attains the objectives of "never running out of hot water", and "lowering utility costs" much more reliably than the tankless water heater option. Please read about FREE HOT WATER.
Weber Refrigeration Heating and Air Conditioning