668S1 Series TwistFlow Distribution Manifold
April 23, 2015

How to install temperature gauges into a distribution manifold?

Caleffi's 668S1 Series TwistFlow™ manifold has a ton of great features.  As of this year they include supply and return temperature gauges as standard!  The wells and gauges quickly install right into the ball valve bodies to indicate supply and return temperatures at a glance.  Cody Mack shows how it's done in the video below.

Besides convenience, an added benefit (if the flow rate of the pump known) is an easy estimation of BTU/hour heat transfer to the manifold distribution system.  Simply multiply the pump GPM by 500, then by the temperature difference between supply and return.  For example, 4 GPM * 500 * 20 = 40,000 BTU/hour. This is great information that proves the system is working as expected!

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Blog post comments
Jim Prisby
April 26, 2015

Great Video.

I would like to see a video showing you installing a well into the SEP-4 when we are using remote sensor to control a condensing boiler. And along with that, I would ask you to show setting a ThermoCon Tank with the Well to do the same thing.

Ideally - I would like to see Caleffi supply these items with the Sep-4 and the ThermoCon.
The Boiler Buddy has a $ advantage and includes the well is one reason I reference this and the SEP-4, although is a nice unit, I feel needs this to give it more advantages and avoids the issue stocking it as a separate part.

Just my 2 cents.

Jim Prisby
July 09, 2015

Thanks for creating the video - I was aware the manifolds were going to start coming with the temp gauges but have not seen the new manifold first hand to know what to expect.

Jonathan Apperley
November 03, 2020

Great post and video