GB 142 24/45 pressure relief valve.

[Vermont Tom]

Wondering why Buderus used a Watts 740 series valve 3/4" in and 1' out on their factory made manifold. I have to replace one on a system. Buderus specs a valve 2 "1/4 high and 2" wide, 3/4" out with 30psi. Why wouldn't a Watts 374A 30 psi, 3" high 2" wide work? and for 1/3 the price. Boiler is rated 149,000 btu max output. 740 is rated 925,000 bbtu and 374a is 550,000

 

[Tom Sawyer]

I'd use either a 174 or a 374

 

[Sponsor]

 

[Vermont Tom]

I'd use either a 174 or a 374

Wondering why Buderus put on such a large valve. Maybe the 1 inch output relieves some unwanted back pressure. 374a is 50 bucks and the local plumbing supply wants 170 for the 740.

 

[Tom Sawyer]

I've never seen a 740 on a buderus boiler and we install a lot of them. Probably he installer had it on the truck

 

[Vermont Tom]

I've never seen a 740 on a buderus boiler and we install a lot of them. Probably he installer had it on the truck

Came prebuilt with the Buderus manifold.