Oversized boiler

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Old 05-05-13, 05:12 PM
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Oversized Crown Boiler

I have recently placed an offer on a 2400 sq. ft., 10 year old colonial in Rhode Island. The boiler is a Crown Tobago TWZ150 with a Carlin burner which has a net output rating of 156,000 BTU. I do not have any heat loss information but this seems way over sized for a modern house of this size. From my search of the Crown website it looks like this is a 4 section boiler that is available in 3 different firing rates (TWZ90, TWZ125, TWZ150) resulting in net outputs from 97,000 to 156,000 BTU. Does this mean I could easily have a technician change the burner setup to lower the output to 97,000 BTU?
Secondly, since I'm planing to stay in this house for 20+ years would it be worthwhile to upgrade to a efficient 3 pass boiler and indirect?

http://www.crownboiler.com/documents...ion_manual.pdf
 

Last edited by DJD775; 05-05-13 at 06:31 PM.
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Old 05-05-13, 05:58 PM
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Looking at the part lists, it seems that the only difference is in the burner assembly.

With only this limited information I would say: It's possible...

Burner specs for the Carlin are in Table 3b of the manual you posted.

Our friend Grady knows the Crown boilers well, maybe he will read this and offer some input...
 
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Old 05-06-13, 04:37 PM
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I'm hoping it is a simple as changing the burner setup.
 
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Old 05-06-13, 05:25 PM
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Nothing say's you can't put in a indirect with whats there.Imo it's not worth putting in a 3 pass now unless it's shot.It should be getting or close to mid 80's unless it out of wack(like to much air)Not a whole lot better with a 3 pass,but if you got the money go for it.
 
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Old 05-06-13, 07:17 PM
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I think Guy noticed something that I didn't...

If the existing boiler is providing the domestic hot water via a 'thankless' coil, then by all means consider adding an indirect to that boiler and convert the boiler to a 'cold start'.

That would seem to make the most economic sense.
 
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Old 05-08-13, 04:52 PM
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An indirect is definitely an option but I would still like to reduce the firing rate of the boiler.
 
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Old 05-08-13, 05:05 PM
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Absolutely! If it's as simple as a few burner changes, do that first... can add indirect anytime afterward.

The 'economic sense' I was talking about was NOT swapping out the boiler...
 
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