A new boiler cost, including installation, averages $, (but the cost can range between $,-$,). We have jobs paying higher than the average plumber salary! All warranties for main heating products are supported through baxi - our parent company. If you are worried or need extra electrical assistance contact our experienced electricians on. Is a combi boiler right for you? One advantage of using a drain snake is you get to reach blockages deep within the pipes. And,.