A free boiler upgrade in the UK can help households improve energy efficiency and reduce heating costs under schemes like ECO4. Eligible homeowners and tenants may qualify for a boiler replacement at little or no cost, depending on income and property conditions. The process typically includes assessment, approval, and professional installation. Understanding eligibility criteria, benefits, and application steps can help you take advantage of this opportunity and upgrade to a more efficient heating system in 2026. read full review »