Introducing hotun detect remote PRV Alarm Unit

The next generation of PRV alarm protection with remote monitoring, accessible alarm control, and flexible installation locations

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The world’s first in-tundish alarm just got smarter!

The hotun detect remote is a category-defining evolution of RA Tech UK’s award-winning hotun detect platform, extending the world’s first in-tundish discharge alarm into a more practical and accessible solution for modern heating installations.

The product addresses a longstanding industry problem: concealed or inaccessible tundish installations where (T)PRV discharge can continue unnoticed, wasting heated water, increasing energy consumption, and indicating potentially serious system faults.

How Does hotun detect remote Work?

hotun detect remote transforms this passive warning point into an active fault-alert system.

Its design combines a compact Master sensing unit, fitted directly to the tundish, with a connected Remote alert unit positioned in an occupied area where warnings will be seen and heard. This overcomes one of the most common practical challenges in domestic and light commercial heating systems that are hidden installations in lofts, service cupboards, risers, or behind fixed panels.

Intelligent Temperature Sensing and Alerts

Unlike conventional alarm products, hotun detect remote does more than simply detect water presence. Its intelligent four-stage temperature sensing helps distinguish between different discharge conditions, giving users and installers valuable fault insight.

The system delivers both 72dBA audible alerts and visual warnings, includes auto-mute, auto-reset, low battery monitoring, manual override, and continuous operational status indication.

Compatible with hotun dry trap tundishes

The hotun detect is compatible with all hotun 100c and hotun SF dry trap tundishes. Its simple design makes it a practical addition to compatible installations, providing an effective way to detect water discharge from a system’s relief valve.

Quick Installation for New Builds and Retrofits

Innovation has not come at the expense of simplicity. The product is battery powered, requires no specialist electrical knowledge, installs in minutes, and is equally suited to new-build or retrofit applications.

hotun detect remote upgrades the functionality of a standard tundish from passive compliance component to intelligent preventative maintenance tool.

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Key Product Information

About hotun detect remote

Key product information at a glance.

Helps save water and energy to heat the wasted water
Auto mute/reset functions as well as manual mute/reset overide
Automatic alarm on low battery power
Specifically meets G3 guidance para 3.55 – “…where discharges from safety devices may not be apparent, eg. in dwellings occupied by people with impaired vision or mobility, consideration should be given to the installation of a suitable safety device to warn when discharge takes place, e.g. electronically operated.”
Suitable for any system where an active audible or visual warning may be useful – EG water storage tank overflows
Helps installers to advertise the benefits of regular maintenance to customers
Simple, quick, hook-on design – Can be fitted to the hotun dry trap tundish within seconds
Battery operated (2032 coin cell, supplied with unit). Requires no specialist electrical knowledge to fit.

Product Title

Product Type

MPN

Unit Measurements

hotun detect remote white

Alarm unit with remote for dry tap tundish

HDRSW-2P

Master unit: (H)60mm

(W) 35mm

(D) 25mm

Remote unit:

(H)60mm

(W) 35mm

(D) 25mm

hotun detect remote black

Alarm unit with remote for dry tap tundish

HDRSB-2P

2 Year Standard Warranty + 1 Year*

RA Tech UK Ltd provides a standard 2 year Warranty (+1 year if registered) from the time of purchase from any manufacturing fault or defects with the product (this does not apply to the battery). To qualify for a free 1 year warranty extension you must register your product within three months of your purchase date.

To register your hotun detect alarm unit, please fill out our online registration form here

Warranty Claims Procedure

If you think you have a faulty product, please fill out our hotun detect Warranty Claims Form or send an email to info@ratechuk.co.uk with the subject title of “Warranty Claim hotun detect” stating the date of purchase (with proof) and let us know what has gone wrong. Alternatively, you could call us on (01332) 702678 and speak to one of our team.

*(if registered – conditions apply)

Click image to enlarge

hotun detect remote technical drawing of master unit

	Temp	Audible	Visual Description	Visual Representation	Repeat (seconds)
Normal Operation	N/A	None	1 x Green flash		8
Stage 1 Warning	Up to 20°C	1 Beep	1 x Red Flash		20
Stage 2 Warning	21 – 60°C	2 Beeps	2 x Red Flash		20
Stage 3 Warning	61 – 85°C	3 Beeps	3 x Red Flash		20
Stage 4 Warning	>85°C	2 Long Beeps	2 x Long Red Flashes		20
Low Battery Warning	N/A	1 Beep	Rapid Red/Green Alternating		30
Mute	N/A	None	1 x Red Flash		20

Industry Recognition

Recognised by the heating industry. We’re finalists!

hotun detect remote has been named a finalist in the H&V News Awards 2026, in the category Domestic Heating Product of the Year – Components & Peripherals.

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