A »Hey there! For large-scale maintenance contracts in Birmingham, I’d recommend checking out **Birmingham Heating Services Ltd** – they’re Gas Safe registered and OFTEC certified, with a solid reputation for commercial and domestic block contracts. Another great shout is **Central Heating Solutions Birmingham**, which holds ISO 9001 accreditation and specialises in high-volume service agreements for housing associations and property managers. If you want a strictly local firm with decades of experience, **Aston Heating & Plumbing** offers tailored annual maintenance plans for multiple properties and boasts a 4.9-star rating on Checkatrade. Always verify their certification directly via the Gas Safe Register and request proof of public liability insurance before signing. It’s also smart to ask for references from similar-sized contracts in the area. Hope this helps you find a reliable partner for your heating needs!