Horstmann Controls
Horstmann HRT4-B battery room thermostat
Horstmann HRT4-B battery-powered electronic room thermostat with TPI control, wired into the heating system, for combi and fully pumped systems.
At a glance
- Also known as 4210162
£53.80
£44.83 ex. VAT · VAT at 20%
Same-day dispatch
Ordered by 4pm Mon–Fri, 10:30am Sat.
30-day returns
Unused, in original packaging.
What it is
The HRT4-B is a battery-powered electronic room thermostat from Horstmann (Secure), wired into the heating system's control circuit rather than mains. It uses TPI (Time Proportional Integral) control and load compensation for closer temperature management than a mechanical stat, and needs 2x AAA batteries to operate once wired in.
Signs this part needs replacing
- Thermostat display is blank or unresponsive with fresh batteries
- Heating fails to switch off at the set temperature, or runs constantly
- Dial or buttons no longer register input
- Case or wall plate is cracked or damaged
Before you order
- Check the part number on the back of your existing thermostat matches HRT4-B
- Fit fresh AAA batteries before assuming the unit has failed
- Installation and connection must be carried out by a suitably qualified person
Compliance
| Barcode / EAN | 5015914240027 |
|---|---|
| Alternative numbers | 4210162 |
No fitment data held for this part.
Documents & drawings
Everything we hold for this part. Where a document exists but we don't hold it, the technical team will source it from the manufacturer — usually the same working day.
No documents held for this part. The technical team will source them from the manufacturer — usually the same working day.
No technical questions yet for this part.
Not sure which part?
Tell the parts assistant what it's going into — the appliance make and model, or the GC number off the data badge — and it will check this part is on the fit list.