Flo-Rite-Temp Model 665DW


Flo-Rite-Temp Model 665DW Instantaneous Steam/Water Heater features a 6″ diameter shell.

Flo-Rite-Temp Model 665DW has 65 GPM capacity with 15PSI steam at a 100°F temperature rise.

The Flo-Rite-Temp Model 665DW Double Wall Instantaneous Water Heater
uses a double wall tube to provide positive separation of the steam and
water in the heat exchanger. The area between the walls of the tubes
vents to atmosphere so you can detect tube failure without
cross-contaminating either the steam or water. The Flo-Rite-Temp 665DW
is well suited for all hot water applications where steam is available
and plumbing codes or safety requirements prevent the heating medium and
the portable water supply from being cross-contaminated.

The Flo-Rite-Temp 665DW Instantaneous Steam/Water Heater has a unique
feed forward design which features a differential pressure diaphragm
actuated mixing unit integral to a shell and tube heat exchanger.

The Flo-Rite-Temp 665DW mixing unit manages the water flow through
the heat exchanger based upon downstream hot water demand and eliminates
the requirement for a modulating steam control valve.

Operating on constant low pressure (2-15PSI) steam, the Flo-Rite-Temp
665DW mixing unit supplies water to the heat exchanger where it is
overheated and then returned to the mixing unit for proportional
re-mixing with cold water to a pre-set outlet temperature.

Speed of Response

The differential pressure diaphragm within the mixing unit rapidly
responds to a change in system demand and significantly reduces the lag
times typically associated with feed back/modulating steam control valve

Failure Safe

The Flo-Rite-Temp 665DW mixing unit’s diaphragm actuated design can
be described as “failure safe” because in the event of a diaphragm
failure the mixing unit will fail with a cold bias and will not allow
hot water to exit the heat exchanger.

Temperature Control and User Safety

Capable of controlling outlet temperatures +/-4°F,
this principal of operation offers the additional relevant benefit of
reducing the waterborne bacterial content of the water during the
overheating process. In addition, with no water storage requirement,
Flo-Rite-Temp 665DW water heaters are a sensible selection as a
component of a broader system design initiative for Legionella risk

Ease of Maintenance

Non modulating constant steam pressure ensures
condensate drainage and removes the potential for water hammer damage
and corrosion. There is no steam control valve to maintain and typically
no supplemental condensate return equipment required.

Ease of Installation

No storage tank, small footprint, access via a
standard doorway and pre-piped packaged solutions reduce installation
time, space and expenditure.

  For submittal drawing refer to:
  Model 415   Single Wall   S5640
  Model 415DW   Double Wall   S5641
  Model 535   Single Wall   S5642
  Model 535DW   Double Wall   S5643
  Model 665   Single Wall   S5644
  Model 665DW   Double Wall   S5645
  Model 665SS   Stainless Steel   S5646
  Model 8120   Single Wall   S5647
  Model 8120DW   Double Wall   S5648
  Model 8120SS   Stainless Steel   S5649

Download Center

Product Literature 

Installation and Maintenance 

Installation Details Form 

Submittal Drawing 
Flo-Rite-Temp Model 665DW

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