Rheem 874A20NF 20 Litre 60 Degree Nat

A Rheem 874a20NF model may be used as an in-series booster water heater to a solar preheat water
heater. When the inlet water temperature is 58°C or higher the fan and burner will not
operate despite water flowing through the heat exchanger. When the inlet water
temperature is less than or equal to 57°C the burner will fire and boost the outlet
temperature to the preset outlet temperature setting provided the flow rate is greater than
3 litres per minute

In this application the preset outlet temperature setting of the heater must be set at 70C to
comply with the requirements of AS 3498.

It may be required by regulations that an approved
temperature limiting device be fitted on 60°C models
(244, 274, 874 series). Where a tempering valve is
fitted and there is not a separate untempered line for
the kitchen or laundry areas, the kitchen temperature
controller will be able to display temperatures above
50°C however the delivered water temperature at the
tap will be that set by the tempering valve which will
be no hotter than 50°C.
To enable delivery of hot water at temperatures
above 50°C a separate untempered line must be
provided that supplies hot water exclusively to
kitchen and laundry areas