Fire Detectors - Heat and Smoke Our Heat and Smoke detectors, including 12v and 24v. Relevance Price: Low - High Price: High - Low Alphabetically: A - Z Alphabetically: Z - A 24v Optical Smoke Detector £10.99 Add to Basket 24v Heat Detector - Rate of Rise £6.99 Add to Basket 24v Heat Detector - Fixed Heat Detector £5.99 Add to Basket 24v Combined Smoke & Heat Detector £10.99 Add to Basket 12v Smoke & Heat Detector £14.99 Add to Basket 12v Optical Smoke Detector £14.99 Add to Basket 12v Heat Detector - Fixed Temperature £8.99 Add to Basket 12V Heat Detector - Rate of Rise £8.99 Add to Basket