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White round wall thermostat, heat only, 24 V, 40 to 90 °F, mercury free, 3.2 oz

Honeywell International

Honeywell International T87K1007 Heat Only Thermostat White 24 V 40-90 °F

SKU CH-QTHF-3GSCW

Heat-only thermostat for 24 V systems with a 40–90 °F range and mercury-free design

  • Product colorWhite
  • Heat-only control for simple heating systems
  • 24 V compatibility suits standard low-voltage wiring
  • Mercury-free design removes hazardous material risk
  • 40 to 90 °F range covers typical comfort settings
  • Light 3.2 oz build eases wall mounting

Heat-Only Thermostat for 24 V Systems

The Honeywell T87K1007 is a mechanical heat-only thermostat designed as a direct replacement for three-wire 24-volt wall-mounted electric heating controls. It suits homeowners and installers who need a straightforward, mercury-free unit for basic heating regulation.

Temperature Range and Wiring Limits

Operation is confined to a 40 to 90 Fahrenheit scale, so the device cannot satisfy cooling or dual-fuel requirements. The three-wire 24 V connection means it will not work with millivolt systems, line-voltage heaters or any installation that demands a common wire for continuous power.

Mercury-Free Mechanical Design

The classic dial mechanism contains no mercury, meeting modern environmental restrictions while keeping the familiar analog adjustment feel. Buyers who want programmable schedules, digital readouts or smart-home integration should choose a different model.

How it compares

Measured against everything we stock in Thermostats & Thermostat Accessories, at today’s prices. Recalculated every night.

Price $32.99
Cheaper than about 73% of the 286 comparable items (median $78.49).

Specifications

Product
Brand nameHoneywell International
Model nameNot Available
Product colorWhite

Questions about this item

Which Honeywell heat-only thermostat model covers the 40 to 90 °F range at 24 V?

The T87K1007 is a single-model, heat-only thermostat rated for 24 V operation with a 40 to 90 °F adjustment range, so there is only one version to choose.

What does the 40 to 90 °F range mean once the thermostat is wired into a 24 V heating system?

It lets you set the heating to maintain any temperature between 40 and 90 °F; the thermostat will call for heat when the room falls below the set point and stop when it reaches it.

What wiring standard does the T87K1007 use and what does that limit in practice?

It is designed for three-wire, 24 V wall-mounted electric heating systems, so it cannot control cooling, fan-only, or line-voltage circuits.

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