Takagi T-K3-OS Tankless Water Heater Indirect Heating Applications for High Use.

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Takagi T-K3-OS Tankless Water Heater
Hydronic Heat - Radiant Heating and Indirect Applications

High Demand Water Heater Applications or Hydronic and Radiant Heat Systems with the Takagi T-K3-OS

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High Volume Indirect Water Heating for Residential & Commercial Applications

The Takagi T-K3-OS Tankless Water Heater 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° below the T-K3-OS. The T-K3-OS is factory set at 122° so if you want to raise your tank temperature above 122° you will have to purchase the T-K3-OS Temperature Remote Control or set the internal dip switches of the TK3-OS.

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 T-K3-OS. 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. 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 T-K3-OS 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.

You can also heat your Radiant Floors, Hydronic Baseboards and Air Handlers with the Takagi T-K3-OS. Just continue down the page to locate the info.

HouseNeeds Inc. sells all the components needed for these systems.

Legend for the Indirect Application with a Takagi T-K3-OS

Components for an Indirect Water Heating System All the components below can be found on the Heating Supply Page or by clicking here. Use the browser back button to return to this page. You must use bronze parts for an all open loop system.
1. Grundfos UP26-99BF Bronze Circulator 2. Bronze 3/4 inch flange set 3. Bronze 3/4 inch flow check (Check Valve) 4. Circulator Relay Please Note: You should obtain the electric hot water storage tank from a local source as the cost to ship one of these is generally more than the cost of the tank itself.
How to set up a T-K3-OS for use as a Hydronic Radiant Heat Source Below is a picture of a T-K3-OS being used for 2 different temperatures. There are primary and secondary loops and the primary is the loop attached to the T-K3-OS. The secondary loops are the high and the low temperature heating loops. To get one high temperature from the T-K3-OS you need to use a primary loop and then a secondary loop to feed your system. To get one low temperature from the T-K3-OS you use a primary and secondary and wire as below. There are various methods for wiring but the best method is to shut off the primary circulator based on the return of the low temperature water so as to not short cycle the T-K3-OS. To get your heat and your domestic hot water from the Takagi you can use many methods. The best method is to use an indirect water heating tank driven off the high temperature loop.
All the needed components can be found on the Heating Supply Page or by clicking here

A Storage Tank (Indirect or Stand-Alone) for use as a Hydronic Radiant Heat Source We do not recommend open loop heating systems as they can be dangerous and more and more local codes are not allowing them. So be careful if you decide to use an open loop heating system. For a few extra dollars you can add a flat plate heat exchanger to the system and get a good heat system and a safe potable water system with one heat source. The example below illustrates this. You may not need all the components illustrated. In the picture below we show a tank - but this could be any heat source that you want to isolate from the heating system. For example - a wood or gas boiler. (If you use non-oxygen barrier PEX with a boiler - then you would need to use something like this.)
Picture of all the parts needed to separate drinking water from your heating system with a Brazed Flat Plate Heat Exchanger and more Click on Image to view a PDF of this image Get Acrobat Reader for free to view manuals if you don't already have it.
All the needed components can be found on the Heating Supply Page by clicking here. Or Individual Components: Circulating Pumps & Flanges Pressure and Temperature Gauges Boiler Pressure Relief Valves Brazed Flat Plate Heat Exchangers Mixing Valves Ball Valves Combination Backflow Preventer and Fill Valve Spirotherm Air Eliminators Expansion Tanks Boiler Drains and Pressure Test Kits

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