Noritz NRC661 6.6 GPM Indoor Natural Gas Condensing Tankless Water Heater

Works great but you may experience a delay in getting hot water to the faucet compared to old hot...

Works great but you may experience a delay in getting hot water to the faucet compared to old hot water tank. I have copper pipes so they are giant heat sinks that are no longer being kept warm by the old water heater. As a result they draw heat out of the water when it is first starting to run, which I expected having dealt with copper pipes and soldering. This should be less of an issue if you have PEX or PVC pipes. To help reduce the heat loss I have placed insulation on all the hot water pipes which has helped reduce the initial hot water time and holds the heat in during the morning so there is very little lag during heavy use periods. If I was on city water I might be concerned about the extra couple of gallons that must be run to get the initial hot water in the kitchen (furthest run). The bathrooms are near the water heater so they take about half the cold water before hot. Once the hot water is there it is never ending. No longer any concerns about family taking long showers or baths. Also this will be great for the initial hot tub fill I will be doing this week. Be sure to check your gas meter capacity. I went with this unit because of the 120K Btu. This plus my gas furnace, gas dryer, gas double range added up to a max Btu that my meter could handle. If I had been over the rating, which would have been the case with a larger unit needing 199K Btu, the utility would require a meter upgrade at a charge of $500