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www.legendhydronics.com

1-866-752-2055

300 N. Opdyke Rd.

Auburn Hills, MI 48326

www.legendhydronics.com

866-752-2055

HS-808 

HYDRAULIC SEPARATOR

Installation Guide

Advantages of the HS-808

- Provides hydraulic separation between the primary & secondary sides of the system.

- Allows for variable system flow and fixed or variable boiler flow, without pump interference between  

  the two sides. 

- Includes a high capacity automatic air vent with service check for the removal of air from the system. 

- Includes a drain valve with ¾” garden hose threads for the purging of collected dirt from the system. 

- Available in up to 6 different connection types, in multiple sizes.

- Has a ½” plugged port where you could mount a thermometer and / or pressure gauge.

- Includes an aluminum embossed insulation shell and aluminum tape.

Pictured: 

HS-808 with LegendConnect™ 

Adaptors

Pictured: 

Sample System

To & From Zones

(e.g. Radiant Manifolds)

High 

Efficiency

Boiler

Hydraulic

Separator 

w/Air Vent

and Purge

Boiler

Circulator

Zone 

Circulators

Introduction

 

The HS-808 Hydraulic Separator is a multi-function device that provides hydraulic separation, air elimination 
and dirt removal in a single, compact device that requires little maintenance. The HS-808 functions as a 

“Bridge and a Disconnect” between a heating/cooling systems power generating unit(s) and the distribution 

system. The flow pattern through the HS-808 depends on the flow rates of the primary and secondary sides 
of the system. (See flow diagrams in the Size Section) The various mixing patterns internal to a hydraulic 
separator create a blending of the primary and secondary flows and temperatures, thus creating a “Bridge” 
between the two sides. Modern hydronic systems, especially those that contain low mass, water tube 
boilers, like a Mod-Con, generally have a relatively high flow / high head pumping requirement to operate at 
peak efficiency on the Primary side. In contrast, the Secondary, distribution side of the system, often has a 
relatively low, even variable flow, with very little pumping head.  The HS-808 Hydraulic Separator provides 
a “Disconnect” between these very distinct requirements on the primary and secondary sides of the system, 
so that they do not interfere with each other. Hence, the “Bridge and Disconnect” benefit of a hydraulic 

separator.  

Additional features of the HS-808 Hydraulic Separator include: Air & Debris Removal - The flows of both the 
primary and secondary sides of the system go into the HS-808 where the fluid velocities slow down allowing 
air to rise and be vented out through a serviceable automatic air vent, and dirt particles to fall out and collect 
at the bottom, ready to be purged out through the Purge Valve with standard ¾” garden hose connection.

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