Indirect Water Heater issues for 16 unit

GW

Hello wall people,

We do some work for a regional yet local apartment complex. One of their 16-units is having a very hard time keeping up with hot water demand. It's a Super Stor-119, very large boiler (does heating also), taco 0011 pump that is sending huge amounts of boiler water. Seems maybe small (119 gal), but other buildings have the same exact set up, and this particular system has been running for 5 or 7 years, just guessing.

What has me baffled is the maintenance dude and I drained down the tank to 95F or so. Most certainly the water at the bottom of the tank would be cold.... I only was getting a 9F drop through the coil. Another building has a newer ss119, I was getting 16F drop with normal conditions. Normal meaning we didn't drain it down, we just cranked the aqua a little to fire it up.

I know these are just numbers, please hold the comments on the old Deltat/gpm equations. My question is what, if anything, can be going on? Maybe they just got lucky all these years and now they have too many people with the same lifestyle? The heat transfer seems dismal.

Is there any better performing water heater? I was thinking about a smart tank from Triangle.

Gary Wilson


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Cosmo_3

open her up

Before buying a new water heater open up the access hole on the top and see if the problem is not a mineral build up on the heat exchanger.

The Triangle tube units are a better fit for applications with hard water.

Cosmo

GW

open it

I must admit i didn't know these could be opened...there's an access? Any how do you clean the coil if there's crud?

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