What's the cost of replacing your boiler? The guys at asap plumbing re-piped my entire boiler system we have been experiencing issues with our heater for years and had multiple contractors out finally found a competent company that got it right. Reviews completed by customers who've claimed on their boiler cover policy. Had a leak in a main supply line, repair required cutting concrete and trenching they got the job done quickly and reasonably priced. That said, there are some simple steps.