Where do I get the connector to hardwire this?

Thank you for your question. The connector is included with the device.

My attic gets very hot in summer (in Dallas).If the outdoor temp is 108 attic could be close to 135 I assume. Will the slow rate of rise prevent the alarm from sounding?

Hello Lenora.... The BRK heat alarm does two things...measures a rapid rise in temp over a short period of time, or temps over 135 degrees (both would likely indicate fire). An attic may not be the place for a heat alarm in Texas since, depending on your ventilation, might exceed that on a summer's day. I placed mine in all places that smoke or monoxide alarms cannot go (kitchen, garage, laundry room, crawlspace, etc. By the way, I currently have extra units as well.

Can this run off only the 9v battery? Want to install in an area without being hard wired.

I believe so but the 9 v is only a backup so if you are using the backup all the time then I can see you have to change the battery every few months. Lightening shorted my unit so it used up th9 v quickly n alarm sounded. That is why I replaced it but with 110v operating voltage.

Does this interconnect with other alarms made by First Alert?

I just installed with 3 Smoke & CO2 (SC7010BV) and 4 Smoke (9120B6CP) and as soon as it was interconnected all of the Smoke alarms were triggered. It is not compatible with these products. Had to leave the interconnect cable disconnected.

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First Alert Hardwire Heat Alarm with Battery Backup

First Alert Hardwire Heat Alarm with Battery Backup

Product ID: 7590481

Details

Alarm
Audible
Brand
First Alert
Color
White
Compatible Devices
Angle Grinder
Global Trade Identification Number
Item Weight
7.04 ounces

📶Interconnects up to 18 devices

🔋9V battery backup for power outages

🔥135°F fixed & rate-of-rise sensing

€ 75.02

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Description

🔥 Stay ahead of heat hazards with smart, fail-safe protection!

SEAMLESS INTEGRATION - Connect up to 12 alarms and 6 compatible devices for whole-home synchronized alerts.
PRECISION HEAT DETECTION - Advanced rate-of-rise tech senses rapid temp spikes to catch danger early.
UNINTERRUPTED PROTECTION - Hardwired 120V power with 9V battery backup keeps you safe even during outages.
REMOTE CONTROL CONVENIENCE - Silence or test alarms effortlessly with most household remotes—no ladder needed.
SMART FALSE ALARM REDUCTION - Microprocessor control minimizes nuisance alerts so you only respond to real threats.

The First Alert Hardwire Heat Alarm HD6135FB combines advanced rate-of-rise temperature sensing with microprocessor-controlled false alarm reduction. Designed for areas unsuitable for smoke alarms, it features a loud 85-decibel siren, 120V hardwired power with 9V battery backup, and remote control compatibility. Interconnectable with up to 18 devices, it ensures comprehensive, reliable fire safety for your home.

Specifications

ASIN	B000Q6LXW2
Alarm	Audible
Best Sellers Rank	#16,831 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #39 in Smoke Detectors & Fire Alarms
Brand	First Alert
Built-In Media	1 pk
Color	White
Compatible Devices	Angle Grinder
Customer Reviews	4.5 4.5 out of 5 stars (791)
Enclosure Material	Plastic
Global Trade Identification Number	00029054508102
Item Dimensions D x W x H	2"D x 2"W x 2"H
Item Type Name	GAS_SMOKE_FIRE_ALARM
Item Weight	7.04 ounces
Manufacturer	First Alert / BRK Brands Inc.
Manufacturer Warranty Description	Warranty
Mfr Part Number	HD6135FB
Model Number	HD6135FB
Number of Items	1
Power Source	Battery Powered
Product Style	Heat Alarm
UPC	029054508102 029054509321
Unit Count	1 Count

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€ 75.02

Duties & taxes included

In stock

Sold byAmazon CroatiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Croatia.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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