Are your drains blocked or draining poorly? we clean household drains. He talked over all of our options, offered advice, clearly had a. Water coming from the discharge pipe may be hot. Baxi does not sell boilers direct to consumers they are supplied to gas safe registered installers through plumbing and heating merchants baxi boilers cost from approximately £570 to £2,172, depending on type and output the cost of installation will vary from home to home and depends on the amount of work the.