???? Cast iron??????

HP80

I was just told today that you can't use a regular holding tank with a cast iron boiler, did I miss something here?
Or like my customer told me today he wants to use his boiler for domestic hot water as well as infloor heating, this part I can easily see requires two circuits.
I was quite surprised to hear that a wrong selection of cast iron/single circuit was a no brainer error?
Please help!!

kevin coppinger_4

I'm not sure ...

I understand the question...I'm sure that you can get both radiant and domectic hot water from the boiler just not using the same water.....indirect or tankless from the boiler for Domestic....mix down the boiler water for the radiant...is that how you meant? kpc

Paul Mitchell

HP

What do you mean by a regular holding tank?

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HP80

Cast Iron

My customer has been told that I am an Idiot for not Knowing that you can't use a single circuit Hot Water storage tank with a cast iron boiler? My question is, Is this true and if so why?

kevin coppinger_4

what would be an...

example of a single circut hot water storage tank? Indirect- superstor,top performer,amtrol hotwater mate? kpc

HP80

storage tank

I am really confused why a single wall storage tank is wrong with a cast iron htex?

HP80

I was told back-up for shower supply

My customer has a 3500 sq/ft ranch style home in the North(Ontario, Canada) that has 100,000 BTUH forced air and 105,000 BTUH Hydronic all purchased from myself (the overnight Hydronic wonder)! I am wondering why the plumbers that are onsite are telling my customer that I am wrong and that when using a cast iron ht/ex section you must use a dual section heat reclaim?

HP80

You are correct!

But do you know how cast iron ties into the answer/problem???

bill clinton_3

ci and hot water

Can't be sure, but it sounds like you're saying you are using a cast iron boiler and want to run hot water straight out of it into a storage tank and supply the domestic hot water system straight out of the tank. This won't work because you would be constantly introducing fresh water into your boiler, which would cause corrosion in the boiler and really muck up your hot water supply. Cast iron boilers are meant to be used in "closed" systems where very little fresh water gets added. Also, it is really a good idea to keep your potable water system separate from your domestic hot water--a heat exchanger will accomplish that.

Bill

HP80

This is what I have found out so far

My customer would like full use of his BUD boiler(solely sold to him based on reveiws from this site) I erally didn't know about any cast iron problems when this equipment was to be used for residential hydronics, Please help!

Paul Mitchell

You lost me

I dont really understand what you are saying. Want to help but still dont know what a regular tank is

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HP80

Bingo

Thank you very much for the reply, this makes sense, I have been around long enough to see this and I was glad to see your reply to confirm that I didn't overlook the obvious!
Thank you again very much!!

HP80

Sorry

I was talking storage tank as requested/vs cast iron. I really can't figure this 1 out??

Paul Mitchell

If thats what you mean. you can nt do that

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John@Reliable_4

Two ways of doing it, I think I know what you mean?

#1 is with a indirect hot water heater, which is just another zone. Boiler water goes thru a coil in tank to heat water, but the two never touch. #2 Is with a tankless coil and a holding tank / electric hot water heater, with this set-up water in tank does go thru coil in boiler but again the boiler water and the hot water never touch. At least I think this is what you mean, I'm I right? John@Reliable

[Deleted User]

like Bill said,

the potable water can in no way, shape or form, touch the cast iron boiler...it can however be heated by the cast iron boiler so long as its done via something like a shell and tube heat exchanger...as far as the storage tank goes, as long as its NSF certified, you could use it..does that help???