The Smoke and Carbon Monoxide Alarm (England) Regulations 2015
All private rental sector landlords, from 1st October 2015, must have:
Landlords MUST make sure that the alarms are in working order on the 1st day of each new tenancy.
Landlords, please arrange for a Carbon Monoxide Detector to be installed at your rented property because CO is a silent killer and it is vital that you take all precautions to prevent your tenant from being seriously injured or worse! The most reliable way of checking CO levels in your house is to install an audible CO alarm. However, you should never rely on them entirely as they are a warning system and not a replacement for regularly servicing appliances.
Penalties for non-compliance are a Civil penalty with a fine of up to £5,000.