Rheem P-M207, P-M267, P-M337, P-M407, M207A Technical Data Manual

B

C

INDOOR

DRAFTHOOD

31-13/16"

7-3/4"

GAS

CONNECTION

J

A

20-1/2"

26-1/2"

ELECTRICAL

CONNECTION

34"

STAC KL ES S

OUTDOOR TOP

28"

4-3/8"

8-7/8"

Technical Data

Digital Low NOx Gas Heaters

CAN BE INSTALLED DIRECTLY

HEATER

ON A COMBUSTIBLE

SURFACE!

Amp Draw

120 volt 240 volt

6 3

Shipping Weights (lbs)

w/ Polymer

Headers

and Stackless

Top

Heater

Model

BTUH
Input
(000)

(A)

Cabinet

Width

(B)

Flue

Diameter

(C)

Indoor

Drafthood

(J)

Minimum Gas

Conn.

Water

Conn.

M207A 199.5 20” 6” 55-5/8” 12” 3/4” 2” 174 12
M267A 266.0 23” 7” 56” 11-1/8” 3/4” 2” 197 15
M337A 332.5 26” 8” 57” 10-3/4” 3/4” 2” 219 17
M407A 399.0 29” 9” 58-1/2” 12-1/2” 3/4” 2” 237 20

Designation for a Digital heater using propane gas is “EP”; a Digital heater using natural gas is “EN”.
Prefix “P” is for plastic (polymer) headers.
Suffix “X” is for cupro-nickel tubing; “C” is for copper Tubing
Example: P-M407A-EN-X = Plastic headers, 407 model size, digital, natural gas, cupro-nickel
For elevations above 5000 feet consult the factory.

Swimming Pool and Spa

Indoor

Draft-

hood

Heating Products

Technical Data

Features

All models

• PolyTuf Textured Powder Coating

The Rheem gas heater has a polyester-coated, non-corrosive cabinet that is more
durable than solventborne- and waterborne-coated metal cabinets. Every piece of
sheet metal goes through a 7-stage wash system, making certain the powder paint
has a perfect bond. Underneath the tough, yet beautiful finish you will find galvanized
metal that offers superior rust prevention and years of durable service.

• Wind-Resistant Design

This heater is designed to draft naturally in outdoor installations with its exclusive
low-profile design. It is so thoughtfully and carefully designed it actually protects
itself from the things that tend to stifle ordinary pool and spa heaters. It delivers
uninterrupted heating performance regardless of falling leaves, wind, airborne debris,
rain, downdrafts, updrafts, sleet, snow, etc. .

• Polymer Headers

Polymer headers prevent rust stains from harming your pool’s surface, giving you
years of trouble-free swimming pleasure.

• All-Copper-Fin-Tube Heat Exchanger

The fin tubes of the heat exchanger are each made from a single piece of extruded
copper. This integral-fin design allows maximum heat transfer to be attained and
maintained. Cupro-nickel is also available as an optional upgrade.

• Stainless Steel Tube Sheet

Stainless steel tube sheets are used on all Rheem gas heaters. This allows for a
completely nonferrous waterway, leaving your pool truly rust-free.

• CPVC 2" Water Connections

Standard with every Rheem is a set of 2" slip-fit CPVC water connections to make your
installation secure and effortless.

• Condensation Protection

The Unitherm Governor helps reduce condensation from low inlet water temperatures.
It automatically regulates the water flow to help keep the water temperature in the
heat exchanger above 105°F. Both water temperature and water flow rate are
controlled to eliminate condensation, sooting, and scale build-up that can shorten
heater life.

• High Flow Rates

The Rheem gas heater comes with an automatic bypass built into the header. You'll
find that the heater is capable of handling water flow at a rate up to 125 gpm.

• Burner Tray

Every burner tray is built to last, from the stainless steel burners to the aluminized
metal used in the heat sensitive areas. Innovative design allows for the easy removal
of the tray and burners for servicing.

• Fire Tile

A ceramic fiber combustion box keeps your heater running efficiently while keeping the
outside jacket cool. By using this space-age material the heater won't retain residual
heat after it is turned off, allowing it to be installed without the use of costly metal
heat sinks.

• Fuel-Efficient

Energy-smart Rheem heaters consistently achieve the highest efficiency ratings. They
exceed all federal and state standards.

• Microprocessor-Controlled Thermostat

The Rheem Digital gas heater features a microprocessor-based control center. This
control allows you to set your pool or spa temperature precisely at your favorite setting
just by pressing the up or down temperature control buttons.

• Self-Diagnostic

On-board diagnostic controls let the user and the service professional know what is
going on with the heater at all times. All information is presented in real English, no
cryptic codes to decipher. In the event that you would ever have a problem with the
heater, the digital display will indicate the source.

• Flame Strength Indicator

A pool industry first! The pilot flame signal is monitored with an easy to read visual
bar display. 4 bars or less indicate a weak signal, letting the service tech know that
the pilot should be checked. 5 bars or more indicate good flame rectification. Ever
heater is test fired before packaging, and the flame strength is verified to be strong
before leaving the factory.

• Voltage Monitor

Transformer output power can be monitored by the circuit board. This helps service
techs diagnose issues quicker and more efficiently.

• Cycle Counter and Run Time Monitor

The control captures every cycle of the main gas valve as well as how long it stays
open. This offers valuable and useful feedback to the service tech. By monitoring the
run times on multiple unit installations, the load can be evenly distributed among the
units, preventing excessive wear and tear on one unit.

• Remote-Compatible

Compatible with most major pool control and remote systems on the market today. Any
two-wire or three-wire remote can connect to the heater and be integrated into the
pool control system of your choice.

• Electronic Ignition

Rheem Digital heaters come standard with intermittent spark ignition pilot safety
controls. What this means is that the pilot only comes on when there is a call for heat.
This provides an energy-efficient way to control your heater’s gas usage by eliminating
the need for a continuous pilot.

• Low Emissions

The Rheem Low NOx gas heater complies with the most stringent state and county
emissions laws. NOx emissions are less than 40 nanograms per joule.

• Fan-Assisted Combustion

A fan delivers cool, controlled combustion air to the sealed burners. Other brands use
a fan to pull hot flue gases through the heater. The Rheem design allows the heater
to outperform others during cold starts and provides longer component life.

Quality assurance

• ISO 9001

We are proud to be an ISO 9001 registered manufacturing plant. It’s one more reason
why Rheem is number one in the heater industry today.

• End-of-Line Test

Every Rheem gas pool heater is plumbed and test-fired before it is put in the carton.
This ensures that your heater will work right out of the box and continue to give you
years of trouble-free operation.

• Quality Check Points

The Rheem assembly process includes six final assembly quality check points that
help to ensure that every Rheem gas heater is built correctly, and built to last.

• CSA-Certified

All of Rheem’s gas pool heaters are CSA-certified to the ANSI Z21.56/CSA 4.7
standard.

In keeping with its policy of continuous progress and product improvement, Rheem reserves the right to make changes without notice

Swimming Pool and Spa

Heating Products

MKG-15-1506 • 02-01-11