Pentair 461020 MasterTemp Low NOx commercial natural gas pool heater, 250K BTU ASMEPentair MasterTemp Low NOx Commercial Natural Gas Pool Heater, 250K BTU ASME, 461020 In stock$3,71799
Pentair 461020 MasterTemp Low NOx commercial natural gas pool heater, 250K BTU ASME
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Pentair MasterTemp Low NOx Commercial Natural Gas Pool Heater, 250K BTU ASME, 461020

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Quick overview

  • 250,000 BTU input Pentair rates the BTUH input on this MasterTemp at 250,000.
  • ASME rated The ASME version of the MasterTemp, which is what commercial specifications normally call for.
  • Heavy duty cupro nickel The high performance, heavy duty exchanger, chosen where water chemistry is hard on plain copper.
  • Digital control Digital control type with electronic ignition, so there is no standing pilot to relight.
  • Low NOx Built to the Low NOx standard that many regions now require on new gas heaters.
  • 120 gpm through 2 inch Rated for 120 gpm flow with 2 inch water connections and a 3/4 inch gas connection.
Full description and specifications ↓

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Product details

The Pentair 461020 is the commercial MasterTemp, an ASME rated natural gas pool and spa heater with 250,000 BTU input and a heavy duty cupro nickel heat exchanger.

What the commercial version adds

Two things separate it from the backyard MasterTemp. It is ASME rated, which is what most commercial specifications and inspectors ask for on a public pool. And the exchanger is the high performance, heavy duty cupro nickel build, which holds up better where water chemistry runs hard on plain copper. On a commercial pool that gets shocked, corrected and pushed harder than a home pool, that difference shows up in the service life.

Controls and firing

Control is digital with electronic ignition, so there is no standing pilot burning fuel between cycles and nothing to relight after a windy night. It is Low NOx rated, which matters in the regions that now require it on new gas installations.

Planning the installation

The cabinet measures 23.02 inches wide, 32.61 inches deep and 28.15 inches high. Water connections are 2 inch, the gas connection is 3/4 inch, and the heater is rated to 120 gpm of flow. Electrically it wants 120/240 VAC, 60 Hz, single phase. Gas heater installation is licensed work, and a commercial ASME heater is not an install to attempt without one.

Specifications
Brand Pentair
Manufacturer part number 461020
UPC 788379858261
Type ASME pool and spa heater, heavy duty
Fuel Natural gas
Heat input 250,000 BTU/hr
Heat exchanger Cupronickel, heavy duty
Ignition Hot surface (HSI), no standing pilot
Headers Bronze, ASME
Certification ASME
Electrical 120 or 240 VAC, single phase, 60 Hz
Amp draw About 5 A at 120 V, 2.5 A at 240 V; 15 A circuit
Water connections 2 in
Gas connection 3/4 in
Controls Digital
Item Low NOx Pool and Spa Heater
Cabinet Width 23.02"
Cabinet Depth 32.61"
Cabinet Height 28.15"
Flow Rate 120 gpm
Shipping weight 144 lb
Ships Freight

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Questions and answers

What people ask about this product, answered by our pool techs.

What is the MasterTemp 250 HD ASME, 461020?
The heavy duty ASME version of the 250,000 BTU heater: ASME certified, with bronze headers and a cupronickel heat exchanger in place of copper. Whether a pool needs an ASME heater is for the local code and the inspector to say.
Does the MasterTemp 250 HD ASME come in propane?
No. Pentair's manual lists the 250 HD ASME, part number 461020, for natural gas only.
Where is the manual for the MasterTemp 250 HD ASME?
Under Downloads on this page, as the Owners Manual. It is Pentair's MasterTemp Installation and User's Guide, part number 472592, which covers the 175,000 to 400,000 BTU models in natural gas and propane, the HD and ASME versions included.
What connections and power does 461020 need?
2 inch water connections and a 3/4 inch gas connection, on 120 or 240 VAC, single phase, 60 Hz. Pentair's manual gives about 5 A at 120 V and 2.5 A at 240 V, on a 15 A circuit.
Can the MasterTemp 250 HD ASME be installed indoors?
Pentair certifies the ASME MasterTemp for indoor installation with its Direct Air Intake Duct Kit. Outdoors it needs no kit.
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