tN2 House Control Zoom

tN2 House Control


Brand: Tekmar

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Ambient Conditions: Indoor use only 32 to 104°F < 90% RH non-condensing
Height (Inches): 5.5
Width: 5-1/2"
Depth (Inches): 2-1/4"
Enclosure Type: NEMA-1
Boiler Relay: 24 V (ac) 5 A
Boiler System Pump Relay: 115 V (ac) 5 A 1/6 HP
DHW Pump Relay: 115 V (ac) 5 A 1/6 HP
Setpoint: Short. 0 - 32 V (ac)
Output: 0 - 10 V (dc) 3K ohms min load impedance
Weight (lbs): 1.37 lbs
Power Supply: 24V (ac)
Zone Valve Load: max combined current (zones 1 to 4): 3.7 A
24 V (ac) 2 A
Sensors: NTC Thermistor
10 k ohm @ 77°F
Includes: 070 Sensor
(2) 082 Sensors
Pump Power: 115 V (ac) 12 A max
Application: HVAC
Type: House Control

Description for Tekmar 402


The House Control 402 is designed to operate as part of a complete hydronic heating system with tekmarNet®2 (tN2) thermostats. It can provide operation of two outdoor reset water temperatures in addition to Domestic Hot Water and Setpoint capabilities. It is easy to add more zones, add schedules or other convenient accessories through the use of the tekmarNet®4 (tN4) Expansion terminals.


  • Enclosure: O-Enclosure, blue PC+ABS UL94-5VA plastic
  • Approvals: CSA C US, meets ICES & FCC regulations for EMI / RFI
  • Ambient Conditions: Indoor use only, 32 to 104°F (0 to 40°C), RH 90% Non-condensing
  • Power Supply: 24 V (ac) ±10% 60 Hz, 100 VA max, Class 2
  • Control Load: 2 VA
  • Zone Valve/Floating Action Load: d24 V (ac) 2 A, maximum combined current (zones 1 to 4): 89 VA (3.7 A)
  • Boiler Relay: 24 V (ac) 5 A
  • Boiler System Pump Relay: 115 V (ac) 5 A, 1/6 HP
  • Mix System Pump Relay: 115 V (ac) 5 A, 1/6 HP
  • DHW Pump Relay: 115 V (ac) 5 A, 1/6 HP
  • Variable Speed Pump Relay: 115 V (ac) 5 A, 2.0 A
  • Pump Power: 115 V (ac) 12 A max
  • Setpoint and DHW Calls: Short, 0 - 32 V (ac)
  • Boil/Mix Modulating Output: t0 - 10 V (dc), 3 kohm minimum load impedance

tN2 House Control


by PowerReviews
TekmartN2 House Control

(based on 4 reviews)

Ratings Distribution

  • 5 Stars



  • 4 Stars



  • 3 Stars



  • 2 Stars



  • 1 Stars




of respondents would recommend this to a friend.


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    • Primary use:
    • Personal (3)

Reviewed by 4 customers

Displaying reviews 1-4

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tn2 not good for solar, poor service

By Solar Installer

from Colorado

Verified Reviewer

Comments about tN2 House Control:

I was using the tn2 for boiler control integrated with a solar hot water system. There is no way to program this boiler control to work with a solar system effectively. Programming in conjuntion with the Tekmar thermostats is extremely complex and difficult.
The mix relay fried and was only putting out 90 volts to pump. I sent it in for repair and after six weeks they say it will be another four weeks. I am told they would prefer I buy a second tn2 while they check out the first one. Meanwhile winter is approaching. UNACCEPTABLE SERVICE!

  • Primary use:
  • Personal

Works great, easy to set up and operate

By Joe

from Huntington Beach, CA

Verified Buyer

Comments about tN2 House Control:

Great tech support, advice. I got the right product and it worked on the first try.

  • Primary use:
  • Personal

Great product, fun as a trip to dentist

By chris

from New Jersey

Verified Buyer

Comments about tN2 House Control:

Im not an professional, Im a tinkerer for systems outside of normal plumbers expertise, such as hydronic floor heating combined with pellet boiler hook-in to an existing boiler loop, pre heating domestic hot water with solar panels and odds and ends people probably do more as a hobby than out of practicality.
The last Tekmar product I used was 25 years ago, an analogue 228 that is still doing its job controlling a mixing valve on a hydronic floor system. I would have prefered to use the old stuff and dreaded learning about the newer house controls
such as the 400 series. Im not happy in general with the direction of the niche markets for controls and distrabution devices. There has been a trend of buyouts and use of cheap materials and bad styling to be competitive.
as always, you have to mix and match different maker's components, that have little desire to work together. For this purpose the 402 lacks much
programability, but does have an amazing amount of input combinations to provide work around possibillities. Getting to understand the 402 was as bad as I feared, and even making the choice which house controller to buy, let alone other mix controllers offered by tekmar, was daunting. Its not that the instructions are bad, It may be that its necessary to take a course or 3 to understand the myrid uses of this controller. I would say the installation of this controller is out of the question for joe plumber or a homeowner. Tekmar does answer any question by email in about 24 hours, But what question to ask? Its better to go directly to Tekmar, the website will try to shunt you over to a local representitive, which I didnt try, but was sceptical of.
The price of about 515 from Pex Supply was very agreeable, I don't know why its necessary to shop around the inflated manufactures suggested retail which is about 1000. I cant speak to the comparison with other controllers, though many are made by Tekmar anyway and rebadged. Might as well get it from the maker, right?


  • Primary use:
  • Personal


By Ron

from Seward, Alaska

Verified Buyer

Comments about tN2 House Control:

The Tekmar 402 house controller was easy to install, works more efficiently and is smarter than anything else on the market today. [...]

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Q&A: Ask the Questions, share answers

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1 Question | 2 Answers
Displaying question 1
  • tN2 House Control


    Can you install the 402 when you need more than one mix water temperature, I have slab, staple up and radiators, each would ideally have its own water temperature. Is there a device to add a second and third mixing valve? If not, what would work?
    Asked on 5/7/2016 by Tahoe from South Lake Tahoe

    2 answers



      The 402 can do all of that with additional components, more piping and
      design work.
      The 402 will run 4 boiler or mix zones.
      You will need at least one zone manager to do two temperatures.
      It can give you boiler reset - by connecting one or more TN2 thermostats to
      the boiler bus - using a separate 313 or 314 zone manager(s) for the high
      temp zones.
      You can have multiple mix temp zones by adding a 440, 441 or 444 mixing
      expansion module, which is wired into the mixing expansion terminals on the
      You could use a thermostatic mix valve for fixed temp mixing for one of the
      mix zones.
      I often size my radiators so that I can use lower temp water which could
      allow the staple up and radiators to share the same water temp on the boiler
      Tekmar has many documents on their web site to help installers specify,
      design and install multi-level controls.
      Reading the entire installation manuals is the best way to sort out your
      Hiring a contractor who has had Tekmar training may be worth considering.
      Clayton Cole
      Solartechnic Contractors, Inc.

      Answered on 5/9/2016 by Solartechnic from Maine


      For multiple mix water temperatures it is recommended to use a 423 Universal Reset Module with attached Zone Manager ex. 335 or 336 (or 334 for 2 wire). You would then add up to three mixing devices known as Mixing Expansion Modules and come in various styles. Such as sku 440, 441, or 444.

      Answered on 5/17/2016 by SupplyHouse Staff from NY
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