Reducing main from 1.5" to 1" for water conditioner

[DrainageQuestion]

Hello,

I had a local plumber install a Halo water conditioner. I just noticed that he installed the H5-100 (1" version) instead of the H5-150 (1.5" version).

To do this, he reduced my water main from 1.5" to 1". Here's the pictures. Does this cause any problems? Do I specifically need the H5-150 to be up to code?

Similar discussions are here and here, which seem to say that this is against code, but I can't find a definitive source and my plumber thinks it's okay.

Thanks for any insight.

 

[John Gayewski]

To know if it's against code you'd have to size your entire house. So count up all of your fixture units and figure a longest run and elevation them size that based on your incoming pressure. If those add up to only needing a 1"service and you have a 1.5" then you can reduce it. If it adds up that you actually need the 1.5"service then it'd have to be upsized.

As far as I know that would be the only way the code would address such a thing.

 

[Sponsor]

 

[DrainageQuestion]

To know if it's against code you'd have to size your entire house. So count up all of your fixture units and figure a longest run and elevation them size that based on your incoming pressure. If those add up to only needing a 1"service and you have a 1.5" then you can reduce it. If it adds up that you actually need the 1.5"service then it'd have to be upsized.

As far as I know that would be the only way the code would address such a thing.

Hi John,

Thanks, that gives me much more to look into, and makes much more sense than a blanket statement that you cannot reduce the main before a softener/conditioner at all.

My water pressure does seem okay so all seems fine as long as it's not an obvious code violation.

 

[Jeff H Young]

To reduce a small section like that isnt the same as say running a long run from the meter all in one inch. an 1 1/2" coming into the house is quite large mine is that size but I think the fire sprinklers are involved just a 3 bath house.
I had a guy that hired me to install a smart whole house shut off I forgwet the details of it i think it uses wifi . It was 1 inch and the service could have been 1 1/4 or 1 1/2 his paper work said it was ok I was a little skepticle but went ahead and installed no issue. I wouldnt balk at 1 1/4 softener but might check into a 1 inch specs.
Just a guess but 1 1/2 " would be for a lot of plumbing or a low pressure area but still at least a 3 bath probebly like 4 or5
Another point is there is a reason someone ran that size Im thinking you got fire sprinklers dont know where they tee off for them ive seen several differant methods