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hello. I've recently purchased a commercial premises. Got a good pyronix alarm and dialler already in there. The pir,s look a bit yellow and dated. Was going to replace them. Was looking at the dual tech ones. Microwave and. Pir in one. I was looking at the bosch bluline and the pyronix ones...

Hello. I have an idea icos boiler. Unvented system with water tank in airing cupboard. I have two thermostats. One downstairs hallway and one on the landing hallway on top of stairs. The problem I got is. If I turn the thermostat up downstairs. The thermostat clicks and the flame light comes on...