Buderus GB 142 45 pressure relief valve

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Old 01-22-15, 12:44 PM
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Buderus GB 142 45 pressure relief valve

Wondering why Buderus would of put such a large pressure relief valve on the manifold. It's a Watts 740, 30 psi, 3/4 in, 1" out. Rated for 925,000 but. I was thinking of replacing it with a 374a 3/4 in, 3/4 out, 30 psi. 550,000 btu. This is just for a 3,000square foot house. max on the Buderus is 149,000btu I believe. 374 is less than a third of the cost of the 740.

Wondering if the 1" out on the 740 has something to do with back pressure issues. 170 bucks verse 55.
 
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Old 01-22-15, 01:07 PM
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Why do you suppose that the valve was supplied by Buderus?

Perhaps it was supplied by the installers?

Some local jurisdictions may specify a list of acceptable valves... I've never heard of VT doing so, but I don't live there so don't know for sure.

You say it's on a manifold? not on the boiler?
 
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Old 01-22-15, 01:25 PM
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It is one of the pre made assembles that is underneath the boiler. It came pre assembled from Buderus. Manifold may not be the proper terminology. Down with the pressure gage and the water in and out. On gb142 system it would be behind the removable foam insulation box. Valve pops out just on the upper left.
 

Last edited by Vermont Tom; 01-22-15 at 02:24 PM.
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Old 01-22-15, 02:26 PM
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I think you're talking about the 'pump manifold'.

I don't know of any reason why you can't use a different relief valve.

This the one that's on there?

0382008 - Watts 0382008 - 3/4" x 1" Boiler Pressure Relief Valve (30 psi)

170 bucks verse 55
You're looking at the wrong supply houses I think!

You mean 72 versus 28 !

0358553 - Watts 0358553 - 3/4" 374A Relief Valve (30 psi)

The 374 certainly has enough capacity for your boiler.

Unless you can find something in the Buderus manual that says you must use that one then I would probably go for the 374...

But let me ask you this:

Why are you looking at replacing it? Is there a problem?
 
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Old 01-22-15, 06:50 PM
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FW Webb is the only one around these parts. I know they are expensive, but my other choice is ordering online. Which I will probably do in the future. I tested it and it won't reseat. Tried tapping with hammer and opening and shutting it. I think I am going to go with the 374. Need it done tomorrow.

Thanks for all your help. It is much appreciated.
 
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Old 01-22-15, 07:44 PM
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Ordering from supplyhouse.com will usually get the 'fast track' items on my doorstep no more than 2 days, usually next day.

Up in VT might take a day longer... two if they need a 4WD truck to get to your town.
 
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