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Question DetailsAsked on 10/24/2017

Costs for replacing a combination domestic hot water and 3-zone heating system to combination tankless in NYC

Replacing a Weil McClain 40 gallon heating (3-zone) and domestic hot water system with a combination tankless system including assiociated plumbing. Two family home has hydronic heating for three zones.

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My recommendation - don't go down that road unless you want grief. Can cost from minimum of probably $5000 or so, commonly more towards $10,000 range by the time you do all the plumbing, electrical, gas changes - and can run even more than that for electric-fired units because many homes (maybe most) do not have an electrical system capable of handling the load unless you previously had both electric water heating and boiler. Plus they are a maintenance headache, very prone to scale formation - and because they are a "fad" item for "greenies", the pricing on them tends to be exhorbitant - I have seen multiple bids from plumbers with 200-500% markup on the equipment.


My recommendation - you already have a combined system plumbed in - if boiler is shot replace for probably $3000-4000 range. If your hot water capacity is off, couple of ways of handling that - one of course in increasing the storage tank to the more normal 60-90 gallon range for commonly about $1000, another is installing a controller for about $400-500 which prevents house heating while significant hot water demand is being pulled by shower or laundry or such. (There are nuances in such a control - like allowing some bypass flow to the heating loops prevent the possibility of a controller failure shutting your heating down entirely in the winter).


Here are links to an Angies List article on tankless heaters, and one previous question with answer on boilers FYI:


https://www.angieslist.com/articles/4...


http://answers.angieslist.com/best-ho...

Answered 1 year ago by LCD




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