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Author:
Ncav1110 (TX)
We are building a new construction home which is currently planned to have two 50 gallon tank water heaters. We have the option to use tankless water heaters instead, and our builder has recommended that we need 2. The house is approximately 2900 square feet with 3.5 baths. Could we be okay with just 1 tankless or is it necessary to have 2?
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Author:
PlumerDan (CA)
if its sized right and you have enough gas avalible i think one should do it.whats the plumber say?
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Author:
Ncav1110 (TX)
We haven't talked directly to the builder's plumber, but our realtor has asked her plumber and he felt there was no need for 2. Just trying to get some qualified opinions, especially because of the added expense of a 2nd tankless heater.
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Author:
packy (MA)
given that your incoming water temperature in TX should be pretty warm (as opposed to northern tier states) you should be fine with one.
figure out you incoming water temperature at it's coldest and then figure out the temperature rise to get it to 125-130F.
up here in new englang my water temp in the dead of winter gets down close to 40. thats 85 to 90 deg rise. the tankless will choke down the flow in order to keep the water hot.
get a good quality tankless such as rinnai or navian and you will be good to go..
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Author:
hj (AZ)
Two tankless heaters, as opposed to one larger one, only make sense if they are separated and each one is installed near an "area of use" to minimize the hot water piping to that area.
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Author:
m & m (MD)
Hj raises a good point. If your 2900 sq ft house is a rancher and the extreme bathrooms are separated by a long distance, consider two units for that application.
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Author:
Curly (CA)
Another benefit of a having 2 heaters (tankless or tank type) is redundancy - If one heater goes down over a long weekend/holiday/parts on order etc. you'll have the other heater to provide hot water. Make sure each heater supplies hot water to a full bathroom. Tankless can be mounted outside - weather permitting - freeing up square footage in the house, saving on venting material and if it leaks water damage should be minimized.
If it is a long run from heaters to fixtures you might consider adding a hot water recirculating loop.
Tankless heaters do not like hard water, you may need a water softener or scale inhibition treatment system.
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Author:
Reidplbg (TX)
It depends on how many shower heads you will have or how many you want t I be able to run at one time. Are you doing anything special with the master shower as in body sprays,rain heads or hand held ?
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