The Heatmiser UH8 8 Zone Wiring Centre v2 is a wired, mains-voltage control hub designed to work with the Heatmiser 4-channel 230V time clock (TM4 v2) and 230V Set Back thermostat (DS-SB v3), while remaining flexible enough to pair with any standard 230V room thermostat. It provides central switching for up to 8 heating zones from a single, compact unit.
Onboard the UH8 are two heating time channels, with each zone able to follow whichever channel suits its schedule, plus two additional time channel connections for hot water control or auxiliary devices. A simple slide switch makes zone 8 suitable for controlling a radiator zone, so mixed underfloor heating and radiator systems can be run from one wiring centre.
8
Wired Heating Zones
230V AC
Supply Voltage
3A
Relay Load / Zone
5A
Total Load
IP20
Protection Rating
6
Actuators / Zone Max
Radiator-Capable Zone 8
A simple slide switch lets Zone 8 be configured as a radiator zone. When set this way, it does not activate the underfloor heating pump, valve or boiler outputs directly, keeping mixed systems clean and correctly isolated.
Qualified Installation Required
This is a mains-voltage (230V AC) wiring centre. Installation and wiring must be carried out by a qualified electrician or heating engineer in accordance with current UK wiring regulations.
Designed for TM4 v2 & DS-SB v3, Compatible with Any 230V Stat
While purpose-designed to work with the TM4 v2 programmer and DS-SB v3 setback thermostat, the UH8 v2 is equally compatible with any standard 230V room thermostat, including the Heatmiser Slimline and Touch ranges.
Eight Wired Zones
Provides central switching for up to 8 heating zones from a single wiring centre.
Two Heating Time Channels
Two onboard heating time channels let each zone follow the schedule that suits it best.
Auxiliary Time Channels
Two additional time channel connections are available for hot water control or other auxiliary devices.
Volt-Free Boiler Connection
A volt-free connection for the boiler ensures compatibility with almost all types of domestic boiler.
Radiator Option on Zone 8
A dedicated slide switch allows Zone 8 to control a radiator circuit independently of the underfloor heating outputs.
Clear LED Output Indication
LED indicators give clear status feedback for each zone, the boiler, pump and valve outputs.
General
Model
UH8 (v2)
Product Type
8 Zone Wired Wiring Centre
No. of Heating Zones
8 (Zone 8 configurable as radiator)
Number of Hot Water Zones
1
Designed For
TM4 v2 time clock, DS-SB v3 thermostat (also any 230V room thermostat)
Dimensions (L x H x D)
384 x 148 x 60 mm
Weight
435 g
Electrical
Supply Voltage
230V AC, 50/60Hz
Control Output
COM/NO (voltage free)
Relay Load Max
3A
Total Load
5A
Actuator Outputs
Up to 6 actuators per zone
Outputs & Installation
Time Channels
2 heating channels + 2 auxiliary/hot water channels
Boiler Connection
Volt-free, compatible with most boilers
Mounting
DIN rail
Degree of Protection
IP20
Warranty
2 years
How does the UH8 v2 differ from the wireless UH8-RF v2?
The UH8 v2 is a wired, 230V mains wiring centre for standard mains thermostats, whereas the UH8-RF v2 communicates wirelessly with RF thermostats. Choose the UH8 v2 where thermostat wiring is already in place or preferred.
Which thermostats and time clocks work with the UH8 v2?
It's designed for the TM4 v2 time clock and DS-SB v3 setback thermostat, but works equally well with any standard 230V room thermostat, including the Heatmiser Slimline and Touch ranges.
Can Zone 8 be used for a radiator instead of underfloor heating?
Yes, a slide switch lets Zone 8 be configured as a radiator zone. In this mode it does not trigger the underfloor heating pump or valve outputs.
How many actuators can be connected to each zone?
Each zone supports up to 6 actuators, within the overall 3A per-zone and 5A total load limits.
What are the two additional time channels used for?
The two extra time channel connections are typically used for hot water control or other auxiliary devices, separate from the two main heating time channels.
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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