Honeywell T87K1007/U Thermosta...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$137.90
$87.90
Honeywell T87K1007/U Thermostat, Round™, Mercury Free, Manual

Honeywell T87K1007/U Thermostat, Round™, Mercury Free, Manual

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Model: T87K1007/U
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$137.90
$87.90
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  • Features

    • The T87K heat only works with 2 or 3 wire heat-only systems
    • Classic Styling
    • Mercury Free
    • Premier White®

  • Accessories

    • 50010944-001/U
    • 50000066-001/U

Manufacturer Resources

Product Specs

Accuracy C :
± 1 C
Accuracy F :
± 2 F
Application:
Heat Only
Cycles Per Hour:
Adjustable 1, 3, 5, 9
Dimensions In :
3 11/16 in. diameter x 1 3/4 in. deep
Dimensions Mm :
94 mm diameter x 45 mm deep
Electrical Ratings:
20 to 30 Vac
Frequency:
50 Hz; 60 Hz
Hazmat Information:
Button cell contained in equipment, Lithium metal button cells only contained in equipment, excepte
Heat Current:
0.02A to 1.0A running
Item Type:
Product
Mounting Method:
Round
Operating Humidity Range Rh :
5 to 90% RH (non-condensing)
Power Method:
Battery assisted power stealing
Product Color:
Premier White®
Sensor Element:
Thermistor
Setting Temperature Range F :
40 F to 90 F
Stages:
1 Heat
Supply Voltage:
20 to 30 Vac
Switch Classification:
Relay
Terminal Designations:
R, W, Y

Honeywell T87K1007/U – Frequently Asked Questions

1) Will the Honeywell T87K1007/U round thermostat work with a heat pump or an air conditioning system?
No. The T87K round thermostat is heat only, single stage, with R, W and Y terminals and no cooling or heat pump changeover control. It works on 2 or 3 wire heat-only systems. If you need cooling or a heat pump, this is the wrong control.
2) Does the T87K1007/U thermostat need a C wire?
No common wire is required. The T87K uses battery assisted power stealing, so it runs off the heating circuit with battery backup on 2 or 3 wire heat-only hookups. Terminals are R, W and Y only.
3) Is this round Honeywell thermostat low voltage or line voltage?
Low voltage. The T87K round thermostat runs on 20 to 30 Vac at 50 or 60 Hz, with a heat current range of 0.02A to 1.0A running. It will not switch a line voltage baseboard or electric heater circuit.
4) Does the mercury free T87K cover the same wall footprint as an older round Honeywell thermostat?
The T87K measures 3-11/16 inches diameter by 1-3/4 inches deep (94 mm by 45 mm). That is the classic round profile in Premier White. Check the paint shadow or hole pattern left by the old unit against that 3-11/16 inch circle before you pull the old base off.
5) Can I tune the cycle rate on the T87K for a boiler versus a forced air furnace?
Yes. Cycles per hour are adjustable at 1, 3, 5 or 9, so you can slow it down for a hot water or steam system and speed it up for forced warm air. Temperature control accuracy is plus or minus 2 F.
6) What temperature range can tenants set on this thermostat?
The setpoint range is 40 F to 90 F. The 40 F low end makes it usable as a freeze protection setting on vacant units. It is a manual thermostat, so there is no schedule or setback programming for a tenant to fight with.
7) Does the Honeywell T87K contain mercury, and what does that mean for disposal?
The T87K is mercury free. It senses temperature with a thermistor and switches through a relay rather than a mercury bulb, so there is no mercury ampoule to recycle. It does contain a lithium metal button cell inside the equipment, which is the only hazmat item noted.
8) Can this round thermostat go in an unconditioned or humid space like a garage or a mechanical room?
It is rated for 5 to 90 percent RH, non-condensing. Damp rooms where condensation forms on cold surfaces are outside that, and so is anywhere the temperature would drive it below its 40 F setting range.
9) Are there accessory parts available for the Honeywell T87K round thermostat?
Two accessories are called out for the T87K: 50010944-001/U and 50000066-001/U. Order them alongside the thermostat if your install calls for them.
10) What is the exact part number to order for the mercury free round Honeywell thermostat in white?
Honeywell T87K1007/U, the manual mercury free Round thermostat in Premier White. That is the full manufacturer part number, suffix included, and it is the only configuration this model comes in.
How fast can I get the Honeywell T87K1007/U delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Honeywell T87K1007/U come with a warranty?
Absolutely. The Honeywell T87K1007/U is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Honeywell T87K1007/U?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
Why buy the Honeywell T87K1007/U from ZenSupply?
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