Boiler Grant Application Funding eligibility are subject to individual assessment under the Government’s ECO4 and GBIS schemes Check Now Qualifying Criteria To qualify for the ECO4 boiler grant, you must meet at least one of the following eligibility criteria. BenefitsLow Income (LA Flex Route 1)Health Route (LA Flex Route 2) Eligibility Check EPC Rating D or Above EPC Rating D or Above EPC Rating D or Above EPC Rating D or Above