Landlords are required to check gas appliances, fittings and flues under The Gas Safety (Installation and Use) Regulations 1998 (2004 in Northern Ireland). You will need to have a check carried out by a Gas Safe Registered engineer within the first 12 months of having a gas appliance installed in the property, with annual checks carried out every year following that date.
You should also keep evidence of your safety check for two years and give it to your tenants within 28 days of the check. New tenants to your property should receive a copy of the check before they move in. Make sure that you keep a record that you have shown your tenants this information by collecting their signature in a space on the check record.