Wireless 433 Smoke & Heat Detector Replacement Notice

SUMRING is issuing a product lifecycle update for B2B distributors, wholesalers, installers, contractors, and trading partners. The SR-820DHR Wireless 433 Smoke & Heat Detector has been discontinued.

At present, approximately 400 units remain in stock, and availability may change quickly as existing inventory is allocated.

For customers who still require the SR-820DHR for existing orders, replacement projects, or channel inventory, we recommend confirming stock before placing a purchase order. Once the remaining inventory is sold, this model will no longer be available for regular supply.

A Replacement Is Available for New Inquiries

To support continuity for ongoing customer inquiries, Sumring can now recommend a current wireless 433 smoke & heat detector with the same core application: combined smoke and heat detection with 433 MHz wireless communication.

This replacement provides distributors, installers, project contractors, and trading companies with a practical alternative when the original SR-820DHR is no longer available.

For buyers wanting to understand the application of combined smoke and heat detection, see our Heat Smoke Alarm guide.

What Should B2B Buyers Confirm Before Replacement?

Changing a detector model should involve more than matching its general product category.

Before approving the new wireless 433 smoke & heat detector, buyers should reconfirm communication protocol, host or system compatibility, installation method, alarm logic, power configuration, certification requirements, packaging, and branding requirements.

This is especially important for existing projects where detectors may need to communicate with previously installed wireless equipment.

For system-level purchasing, our Building Fire Alarm System Components Guide explains how smoke detectors, heat detectors, control panels, manual call points, and notification devices form a complete fire alarm solution.

OEM & ODM Support for Replacement Projects

This product transition is part of Sumring’s ongoing product-line and supply management. Sumring supplies smoke alarms and other fire alarm equipment and supports OEM/ODM cooperation for eligible projects.

For customers sourcing multiple fire safety categories, you can also review our One-Stop Fire Safety Equipment Supplier solution.

OEM and ODM options can include logo, packaging, appearance, function, and project-specific customization, subject to confirmed requirements.

Contact Sumring

If you currently purchase SR-820DHR or have customers requesting a wireless 433 smoke & heat detector, contact Sumring with your required quantity and application.

We can confirm the remaining SR-820DHR inventory and recommend the appropriate replacement for sample evaluation or bulk purchasing.