Honeywell Home T135C110AEU DT135 Digital Wired Thermostat

Honeywell Home DT135 T135C110AEU is a wired digital thermostat for heating, described as non-programmable in its title and product features. It offers button-operated preset temperature settings and an LCD, but listing details conflict on programmability and power, so verify the exact configuration before purchase.

At a glance

Button-operated controls and an LCD for setting and viewing room temperature.
Three temperature settings are described, including comfort, economy and holiday or frost-protection presets.
The listing describes selectable TPI or conventional heating control modes.
Pump protection is claimed to run the pump for one minute every 24 hours.
Manufacturer claims compatibility with standard and combi boilers and gas, oil or electric heating systems.

Price

£21.40Save 29%

Reference price: ~~£29.99~~

Price checked: 12 Nov 2026

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Pros and cons

Pros

Presets allow temperature changes at the touch of a button without setting a timed schedule.
The listed 0.1-degree display increment gives a fine-grained temperature readout.
The manufacturer describes compatibility with several boiler and heating types, subject to installation requirements.

Technical specifications

20 specifications

Identity
Brand	Honeywell Home
Model	T135C110AEU

Display
Screen technology listed	LCD

Connectivity and controls
Connection protocol listed	BACnet MS/TP
Control method	Push Button

Power and battery
Power configuration	Corded Electric

Installation
Mounting type	Wall Mount

Heating operation
Heating control	On/Off switching; Relay 230V 5(2)A.
Heating cycle options	Proportional Adaptive Mode (TPI): 15 or 20 minute heating cycles or conventional mode with temperature span of ± 0.5°C.
Temperature display increment	0.1 degree
Temperature reading accuracy	+/- 0.5°C (+/- 0.9°F)

Compatibility and use
Claimed heating compatibility	Compatible with gas, oil or electric systems. Ideal for use with standard and combi boilers (On/Off; Relay: 230V 5(2)A), electric heating, zone valves.
Control presets	Comfort economy and holiday (frost protection) Presets enable temperature changes at the touch of a button
Pump protection	Pump protection activates pump for one minute every 24 hours to prevent seizure

Electrical and environmental limits
Maximum resistive mode	5A @ 240 VAC
Maximum inductive load	2A @ 240 VAC
Operating temperature	0°C to 50°C (-32°F to 122°F)(95% relative humidity without condensation)
Storage temperature	20°C to 50°C (-4F to 122F)
Protection degree	IP 20
Compliance claim	RoHS-Directive 2011/65/EU

What to know before buying

Listing details to confirm

Listing details are contradictory or unconfirmed: the title and heating features call this non-programmable, while detail fields label it programmable. The connection is described as wired, but BACnet MS/TP is listed under a wireless-connection label. Power is listed as corded electric, while manufacturer specifications say two alkaline batteries are required and not included. Confirm the selected model’s programming, connection and power arrangement before buying. The manufacturer also gives conflicting operating-temperature limits, so confirm the applicable specification.

What’s in the box

Included

Wall mount
Back plate

Who is it for?

A good fit for

Buyers seeking a wired, button-controlled heating thermostat with preset temperature settings rather than a weekly schedule.
Installations using a compatible On/Off heating system where the stated relay ratings and wiring are suitable.

Less suited to

Buyers who need confirmed timed or app-based scheduling, wireless operation or a verified power configuration.
Installations where compatibility with the existing boiler, wiring or control protocol has not been established.

Honeywell Home T135C110AEU DT135 Digital Wired Thermostat · photo 2 — Additional product photo 2

Customer reviews on Amazon

4.1 / 5 · 451 ratings

5 stars59%59%
4 stars19%19%
3 stars9%9%
2 stars6%6%
1 star7%7%

Customer feedback reports that users find it easy to install and operate, with positive comments on build quality, appearance and accuracy. Experiences with temperature control are mixed, including reports of overshooting or undershooting the set temperature. For buyers choosing this wired thermostat for simple preset adjustments, ease of use matters, while the reported control variability makes the listing’s stated operating mode and system compatibility important to confirm.

Positive themes

Customers describe installation and operation as straightforward.
Customers praise the build quality, appearance and perceived accuracy.

Mixed feedback

Temperature-control feedback is mixed, with reports of both accurate control and overshooting or undershooting preset temperatures.

Frequently asked questions

Is the DT135 programmable?

The listing conflicts: its title and product features describe a non-programmable thermostat, while a detail field says programmable. Confirm the exact model specification before purchase.

What heating systems is it listed for?

The manufacturer claims compatibility with standard and combi boilers, gas, oil or electric heating, and zone valves. Check that the system and wiring match the stated On/Off relay requirements.

Does it use mains power or batteries?

The listing gives Corded Electric as the power configuration, but manufacturer specifications state that two alkaline batteries are required and not included. Confirm the power arrangement for the selected item.

What controls and display does it have?

It is listed with push-button controls and an LCD. Manufacturer material describes temperature presets and a display in 0.1-degree increments.