Serving homes & businesses in the greater st croix area for over 60 years! Your boiler replacement cost will largely depend on the type of boiler you used or are now installing without labor. Specialist in domestic plumbing. If you need to replace your existing vaillant boiler, here’s everything you need to know. On the bright side, there is a cheaper alternative for all boiler repairs and replacements more often than not, a. Providing your insurance company with the paperwork,.