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New thermostat for hot water boiler...don't need a smart one

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FloMo201
FloMo201 Posts: 70
in THE MAIN WALL

Hi All,

As we near heating season in the northeast, I remembered that 1 of 4 thermostats died at the end of last winter. I have yet to replace it. I only have 2 wires to the thermostat, and a 24v transformer at the boiler, no C wire. 4 zone vales, and 1 circulator. Boiler is a Peerless MI. I'd like to change all 4 thermostats and need a recommendation.

Google gave me the Honeywell T4 and the Honeywell Home XP2…both simply and not smart thermostats from what I can tell. I also understand that Honeywell has RedLink, which I think solves my no "C" wire but communicating wirelessly.

Any recommendations would be great. Im just trying to keep things simply…seems like we have enough complication in our lives.

Thank you, Flo

Comments

  • FloMo201
    FloMo201 Posts: 70

    I should have noted that I have service set up for the boiler already and spoke to them about this. They came back with Honeywell T6, which appears to be a smart thermostat and needs a "C" wire to operate…so I thought I'd post here before they do anything.

    Flo

  • Alan (California Radiant) Forbes
    Alan (California Radiant) Forbes Posts: 4,849
    edited 4:11PM

    These are the thermostats that I stock on my truck. Neither of them need a “C” wire.

    White-Rogers 1F80-361
    Honeywell PRO 6000, model TH6110D1021

    Last time I checked, the W/R is a bit less expensive. Also, the W/R has the wire opening on the right hand side of the baseplate and the Honeywell has it in the middle which can make a difference when trying to cover up holes in the wall.

    8.33 lbs./gal. x 60 min./hr. x 20°ΔT = 10,000 BTU's/hour

    Two btu per sq ft for degree difference for a slab
  • EdTheHeaterMan
    EdTheHeaterMan Posts: 12,705

    The simplest thermostat is one that has no electronics, no batteries and no programing available. WR 1C20-101. it is a snap action set of contacts that are triggered by a bi-metal spring that bends with the temperature.

    you only get 1 temperture choice that is alwayse the same 24-7.

    If you want programing with only 2 wires then you will need something like 1F80-361 that requires replacement batteries. that means a no heat call in about 2 years the will remind you to change the batteries in the other 3 thermostats. These programable thermostats will have more features than you need like Cooling and Fan operation and eved reversing valve operation for heat pump applications. The Analogue snap action thermostat is the lowest cost and easiest to understand thermostat.

    One Big Caution

    If you are using a Taco 570 (three terminal) zone valve, you MUST set the heat anticipator to the shortest setting on those thermostats. otherwize you may burn out the heat anticipator resistor, rendering the thermostat in the failed open position. (or always satisfied position)

    Edward Young Retired

    After you make that expensive repair and you still have the same problem, What will you check next?

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