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Author Topic: Navian NCB-240 condensing boiler for back up?  (Read 1885 times)

Smokeless

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Navian NCB-240 condensing boiler for back up?
« on: May 18, 2017, 07:29:00 PM »

Looking for your thoughts on these wall hung units. The reviews do not look good for them. I have to tie into one that has the primary loop already existing.
 I seen the Navian run. It came up to temp very fast. It was lp. 18-120,000 BTU. Has a small flat plate for the DHW. And CPVC for exhaust n intake. It's own circulator inside.
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JD 401-c /Honda300atv/CAT 922-B/twofarmallCubs/2135 diesel Massey/8 chain saws/JMSloader/ 2017 Chevy Duramax 2500 HD
HeatMaster/Logstor  dealer for North east area NY VT NH MASS. Sales, installations, troubleshooting of hydronic systems and gasification issues.  Saratoga co, NY

slimjim

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Re: Navian NCB-240 condensing boiler for back up?
« Reply #1 on: May 19, 2017, 03:11:06 AM »

Is it a real primary loop that circulates constantly or does all the water in the loop flow through the heater?most guys who install them do not use injection from the boiler to the loop and use the zone circus to make the loop flow.
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Wood boiler sales, service and installation for the Northeastern USA.

Smokeless

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Re: Navian NCB-240 condensing boiler for back up?
« Reply #2 on: May 19, 2017, 03:23:34 AM »

Yes on the injection into the header and yes on the zone circulators pulling the water by the header. So no way to divert the hot water from OWF ,up inside to heat the flat plate for DHW Im thinking it will have to run to make DHW ? 
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JD 401-c /Honda300atv/CAT 922-B/twofarmallCubs/2135 diesel Massey/8 chain saws/JMSloader/ 2017 Chevy Duramax 2500 HD
HeatMaster/Logstor  dealer for North east area NY VT NH MASS. Sales, installations, troubleshooting of hydronic systems and gasification issues.  Saratoga co, NY

slimjim

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  • Southern Maine
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    • www.mainlycustom.com
Re: Navian NCB-240 condensing boiler for back up?
« Reply #3 on: May 19, 2017, 03:41:10 AM »

Or a separate small flat plate in the domestic line could be used and the heater shut off with a strap on aqua stat, you should be cautious as some on demand units are not modulating and could overheat.
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Wood boiler sales, service and installation for the Northeastern USA.