The Drayton HTS3 Cylinder Thermostat (13007) controls domestic hot water temperature on vented hot water cylinders, helping to strike the right balance between comfort and energy efficiency. Fitted directly to the cylinder, the HTS3 gives reliable, consistent control of stored hot water using a proven bi-metal sensing element, and delivers genuine energy savings when set within the recommended 60°C to 65°C range.
With a wide 50°C to 80°C adjustable range, tamper-resistant construction and double-insulated design requiring no earth connection, the HTS3 is a straightforward, dependable choice for both new installations and cylinder thermostat replacements.
50–80°C
Temperature Range
60–65°C
Recommended Setting
SPDT
Switch Type
3(1)A
Switch Rating, 230V AC
100×40×45mm
H×W×D
1.5 Years
Guarantee
Wide Adjustable Temperature Range
Covers 50°C to 80°C, giving flexibility to set hot water storage temperature to suit the household while supporting energy-efficient operation.
Energy Savings at 60–65°C
Setting the thermostat within the recommended 60°C to 65°C range helps reduce energy consumption while still delivering comfortably hot water.
Bi-Metal Sensing Element
A proven bi-metal sensor provides reliable, consistent temperature sensing directly on the cylinder wall.
Tamper Resistant
The tamper-resistant design helps prevent accidental or unauthorised adjustment, suiting both domestic and light-commercial settings.
Double Insulated
Being double insulated, the HTS3 requires no earth connection, simplifying installation while maintaining electrical safety.
Positive On/Off for Testing
A positive On/Off switching action makes commissioning and fault-finding straightforward for engineers.
Important Safety Information
Wiring must comply with current IET wiring regulations (BS 7671) and should be carried out by a competent electrician. Always isolate the electrical supply before fitting or adjusting the thermostat.
Good to Know
The HTS3 is supplied with a plastic-coated spring fixing wire for easy attachment to hot water cylinders and is suitable for use with vented cylinders across most system types.
Technical Specification
Identification
Brand
Drayton
Model
HTS3
Manufacturer Part Number (MPN)
13007
Range
Cylinder Thermostats
Country of Origin
UK
Thermostat
Sensing Element
Bi-metal
Temperature Range
50°C to 80°C
Recommended Setting
60°C to 65°C
Differential
Approximately 8°C
ErP Temperature Class
Class I, 1%
Electrical
Switch Type
SPDT
Switch Rating
3(1)A at 230V AC
Insulation
Double insulated, no earth required
Physical & Fixing
Height
100mm
Width
40mm
Depth
45mm
Colour
White
Fixing
Plastic-coated spring wire, hook and eye
Standards & Warranty
Compliance
Current IET wiring regulations (BS 7671)
Manufacturer Guarantee
1.5 years
Typical Applications
Vented hot water cylinders requiring reliable, adjustable temperature control. Replacement of an ageing or faulty cylinder thermostat on existing domestic hot water systems. Energy-efficiency upgrades, where setting stored hot water to 60–65°C helps reduce standing heat losses.
Frequently Asked Questions
What temperature should a cylinder thermostat be set to?
Drayton recommends setting the HTS3 within the 60°C to 65°C range. This balances comfortable hot water delivery with energy efficiency, while still helping guard against bacterial growth in stored water.
Does the HTS3 need an earth connection?
No. The HTS3 is double insulated, so it does not require an earth connection, simplifying installation on most cylinders.
How is the thermostat fitted to the cylinder?
It's supplied with a plastic-coated spring fixing wire that hooks around the cylinder, holding the sensing element firmly against the cylinder wall for accurate temperature sensing.
What does 'positive On/Off for test purposes' mean?
The thermostat includes a positive switching action that lets installers manually force the contacts fully on or off, which is useful for commissioning checks and fault diagnosis.
Is the HTS3 suitable for all hot water cylinders?
The HTS3 is designed to be easily fitted to hot water cylinders and suits a wide range of vented system types found in UK domestic properties.
BTU & WATT Calculator
Room Dimensions
Room Type
Living Room
Bedroom
Kitchen
Bathroom
Conservatory
Hallway
Glazing Type
Single Glazed
Double Glazed
Triple Glazed
External Walls
0 Wall
1 Wall
2 Walls
3 Walls
4 Walls
Insulation Level
Poor
Average
Good (New Build)
Required Heating
0
Watts
0
BTUs
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