Takagi Tankless Water Heaters can be used as an indirect water heater in conjunction with a storage tank for high volume situations. The Storage tank should be 30 gallons or larger and must always be set at least 5 degrees below the Takagi Tankless Water Heater.
The standby losses that are associated with typical gas water heaters are eliminated because there is no flue dumping the stored heat out of the storage tank. Recovery time can be over 5 to 6 times faster than a typical gas water heater due to the high recovery rate of the Takagi gas tankless water heater. Efficiency is also maintained over time, which is not the case with a storage tank water heater.
You should use a typical electric tank water heater for the storage tank - you disconnect the heating elements and use the lower aquastat to activate the circulator relay to turn the circulator so when the tank's aquastat calls for hot water - it activates the circulator that will pump water from the tank to the Takagi tankless water heater and then back to the tank. You can use different size tanks to accommodate up to 5 bathrooms or more. For those of you using multi-shower heads - this is an excellent and efficient way to use multi-shower heads and still get the efficiency of a tankless water heater.
To use the Takagi Tankless Water Heater as a heat source for your heating system - you can heat your Radiant Floors, Hydronic Baseboards and Air Handlers with the Takagi Tankless Water Heater. Just continue down the page to locate the info.