Description
Honeywell Home evohome HR91 Radiator Controller (HR91)
The Honeywell Home evohome HR91 Radiator Controller is a sleek, silent and display‑free wireless TRV, designed to give you precise room‑by‑room heating control when used with the evohome heating system. Perfect for bedrooms, hallways, children’s rooms and radiators inside cabinets, the HR91 offers energy‑saving performance without the distraction of a built‑in screen.
Key Features
- Clean, screen‑free design – ideal for low‑interaction areas or where a display isn’t needed.
- Two‑way RF communication with your evohome controller for reliable temperature control.
- Open‑window energy‑saving mode that temporarily shuts off the radiator if a rapid temperature drop is detected.
- Child‑lock function to prevent accidental changes.
- Fits most standard TRV bodies (M30 x 1.5mm) with adapters available to purchase for other valve types.
- Long battery life – powered by 2 × AA alkaline batteries (approx. 18 months).
- Supports up to 12 zones when used as part of an evohome multi‑zone system.
- Easy DIY installation with quick‑lock mounting baseplate.
What’s in the Box
- 1 × Honeywell Home evohome HR91 Radiator Controller
- 2 × AA Batteries
- 1 × M30 x 1.5mm Mounting Adapter
- Installation & User Guide
Technical Specifications
| Temperature Range | 5°C – 35°C |
| Ambient Operating Temp | 0°C – 50°C |
| Power | 2 × AA alkaline batteries |
| Valve Fitting | M30 x 1.5mm |
| Material | Polycarbonate |
| Communication | 2‑way RF with evohome |
| Protection Rating | IP30 |
| Width | 60 mm |
FAQs
What’s the difference between the HR91 and HR92?
The HR92 has a screen and allows local temperature control; the HR91 relies on the evohome controller or mobile app and has no display, making it slimmer and quieter.
How do I bind the HR91 to my evohome controller?
Press and hold the right button for 5 seconds until the LED flashes amber. A solid green light confirms successful binding with evohome.
Does the HR91 support open‑window detection?
Yes — it automatically closes the valve for a short period if it senses a rapid change in room temperature.
What do the LED’s on the front of the HR91 do?
The LED’s are used by the HR91 to provide feedback to the user. Please see our HR91 troubleshooting guide for more details – HR91 Troubleshooting
Perfect For
- Kids bedrooms and communal spaces
- Radiators enclosed behind covers
- Child‑friendly zones
- Homes wanting discreet smart heating control
Upgrade your evohome system with the HR91 for refined temperature control, quiet operation and modern energy‑saving performance.
HR91 vs HR92 – What’s the Difference?
| Feature | HR91 Radiator Controller | HR92 Radiator Controller |
|---|---|---|
| Display | No display (LED indicators only) | Full LCD display with local readout |
| Local Temperature Adjustment | Basic preset override only (21°C / 5°C) | Fully adjustable temperature using the dial |
| Local Status Info | Status shown only via LED | Status shown on screen (valve position, temp, mode) |
| Noise Level | Very quiet / near‑silent | Quiet but audible motor during adjustments |
| Best For | Kids bedrooms, radiator covers, guest rooms | Main living areas where local control is useful |
| Child Lock | Yes (via evohome) | Yes |
| Open‑Window Detection | Yes | Yes |
| Battery Type | 2 × AA | 2 × AA |
| Battery Life | Approx. 2 years | Approx. 2 years |
| Valve Compatibility | Fits M30 × 1.5 mm (adapters available) | Fits M30 × 1.5 mm (adapters available) |
| Typical Use Case | Zones controlled entirely from evohome controller/app | Rooms where users need direct control at the radiator |
| Price Range | Lower (budget‑friendly) | Higher (premium model) |
Summary: Choose the HR91 for quiet, discreet installation with control via the evohome controller or app. Choose the HR92 if you want full local control and a built‑in display.
