Buffer tanks ?

Jim Miller_2

what are you all using for buffer tanks on radiant jobs?
I am planning to use a Munch T80 and a superstor, but the SSU won't work for buffer the way I see it.....

thanks

jalcoplumb_2

HTP Buffer

HTP makes a SSU buffer tank. It has 4 - 1 1/4" tappings and a tapping on the top for a vent. It comes in various sizes. Give them a call they are very helpful.

Joe Brix

reverse indirects

Just get an indirect that has the DHW in the coil and the tank filled with boiler water. BEcomes your buffer and hot water source. Just need an anti-scalding valve on the hot water supply. Checkout www.ergomax.com, www.thermo2000.com, dunkirk artesian, Laars duraflow, www.tfi-everhot.com

hr

Pretty much

all the water heater manufactures offer blank insulated tanks, if you don't need a HX coil this is the least expensive insulated tank.

Lochinvar now offers tanks the 2" foamed RVU models, in the 120, 200, 300, and 500 gallon size (ASME) with plenty of taps for buffer applications.

I have used electric water heaters, as they are readily available, and inexpensive. The element holes 1" NPT can be used for additional connections.

hot rod

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Jim Miller_2

thanks for all the input - I did not think about using the element holes for piping!

Wayco Wayne_2

Yeah!

use electric water heaters all the time. I've been curious about the Dunkirk Artesian indirect though. Has anybody used one yet??? WW

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Jim Miller_2

piping the water heater as buffer

- should it be opposite of what I would pipe it as water heater - what I mean - do I want to draw the coldest water out of it (bottom) to send back to the boiler so that the Munch will operate at cooler temp or will the colder water cause the controller to ramp up the firing rate or how does that work?

hr

I would say

that putting the buffer on the return so the condensor sees the cooler temperature make sense. Think I recall seeing some tekmar piping schematics drawn the way.

I have a local supplier that carries 1" male by 1-1/4" copper adapters. This allows for some larger flows when you use the element ports.

I use a hole saw to place a neat hole in the element service cover.

If you use glycol or other inhibitor chemicals, I'd recommend removing the anode rod. Unless you use Rhomar or other "all metal" friendly chemicals. In a closed loop application the anode isn't all that necessary, IMO.

hot rod



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jalcoplumb_2

buffer drawing & pic.

This is an old job we did about 2 to 3 yrs ago. Working great. The system has a Tekmar 361. The boiler sensor is in the buffer. The slab is about 15,000btu.