The Element C series, Burnham's Independence IN3 and Sentry Slantin models are some of the cheapest residential boilers available, as of 2015. Pricing from major distributors, such as The Home Depot, EComfort.com and Supply House, typically have the least expensive residential boilers priced between $1,000 and $2,000.
Comparatively, high efficiency models generally cost several thousand dollars more. Equipment expense is not the only consideration for overall boiler cost. Cheap boilers come in oil and gas fuel options. Regional fuel price differences cause significant operating cost variances. Check for low cost loans, rebates and tax credits available for installing energy efficient boilers, which can help offset the difference in price.