Will a gas heater operate at the low speed of a dual speed motor?
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Probably not - Most gas heater will shut off at low GPM levels (20-40) to keep the heater cores from overheating - 20 for 200 BTUs, 40 for 400 BTUs. Depending on your pool system you might get these GPM levels at the low speed but generally these heaters must be run at the motor's high speed.
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Is this heater a milliamp system or does it require hard wiring? My exist system is a Pentair 250m Minimax. My exist pump is only 1/2 hp. Which system would you recommend?
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Hi Rod, This heater is an electronic unit which requires hard wiring. It requires a flow rate of 25 gpm in order to activate the flow switch.
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For how many gallons is this 250BTU heater good for? Trying to figure out whether a 400 or 250 as option…. Trying to keep cost down… Thank you for any information you can give.
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Hi Ernest, Heaters are size based on the surface area of the pool or spa not by the volume. You can check out our How To Select a Gas Heater For Your Pool or Spa guide and How Much Does it Cost to Run My Pool Heater? blog for additional info.
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My heater is 5 yrs old and is making a horrible, loud noise when heating. It is still heating, but I am hoping it can be repaired so it is more quiet. Any ideas about why it would suddenly sound so loud?
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Sounds like it might be the heat exchanger. We have RayPak heater models that have cupro-nickel heat exchangers which makes it a lot less corrosive than regular heat exchangers.
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Unit Mastertemp 250 unit sit outside or does it have to be enclosed.
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This unit can be installed outdoors. Here is a link to the Pentair Heater Mastertemp Owners Manual if you would like to view information on the installation of this unit. Thank you for your question!
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I have a 25,000 gallon pool and looking for a pool heater. What are the differences between the 200,000 and the 250,000 btu furnaces. Do I really need the 250,000 furnace?
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Hi, Jim. The BTU's are the difference between the models. The 250,000 BTU will heat faster than the 200,000 BTU heater. Heaters are size based on the surface area of the pool, if your surface are is 500-650 sq.ft then you will need the 250K unit.
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How hard is it to switch a Pentair 250 from natural gas to propane
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There is usually a conversion kit for do that but I recommend giving Pentair a call first to discuss with one of their techs what all that entails.
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My Pentai minimax will fire up if I jump the TH terminals, but shuts right off and does not run. it's 250 btu.
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Hi, Doyle. It could be a bad wire connection or ignitor module. Review the Pentair Heater Mastertemp Owners Manual to troubleshoot the unit or have a technician take a look at it.
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My gas connection and pump connections are on opposite sides than what is shown. Would that be a problem?
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Hi, Ron. That would not be a problem if you have to proper clearances for the installation.
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What is the forecast life-expectancy, or real time life, of this heater? Thank you
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It is difficult to say how long a heater will last. Ultimately, it will depend on how it is maintained. Also, you will want to closely monitor the pH, alkalinity and calcium levels in the pool and ensure that they are always in the proper range.
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On the Pentair heater Model # NOx - 460732 either 110 volts or 240 volts. Or is it 110. Or 240. I need to know which line to run to the heater.
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Hi, Jim. You can run either a 120V or 240V/60Hz/1Ph line to this unit. The unit will operate using fewer amps at 240 volts.
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on the mod. NOX-460732 what is the breaker size for the 240v and 120v heater,and min. circuit ampacity for both heaters. Is there anything extra needs to be ordered for either one depending on what voltage we go with. Thanks Jerry
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Hi, Jerry. A circuit capacity of 15 amps is required for either 120V or 240V. You will not need anything else depending on the voltage you use.
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What is the significance of the elevation detail regarding natural gas inground pool heaters?
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Hi. This is explained in our High Elevation Heater Blog.
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Can the mastertemp 250 be controlled with WiFi phone app?
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Yes this heater can be controlled by phone but that feature is only available if you go with a complete automation system like the Pentair IntelliTouch and then purchase the Smart Phone Accessory Option
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what is the part number of the ignitor for the Master Temp 250 i need to replace mine
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Here is the link to the Ingnitor for the Pentair MasterTemp 250...Ignitor w/ Ignitor Gasket Kit - 77707-0054
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What is part number for heater for salt pool.
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Hello Michael. According to Pentair Technical Service (verified 3/21/2022), The Pentair Pool Products MasterTemp 250K BTU Natural Gas Heater model EC-462026 IS compatible with Salt Water Pools under the following condition; salt concentration must be maintained at less than 6000ppm. Attached please find an updated copy of the Operation & Installation Manual for the Pentair masterTemp Series Gas Heaters. Please note section 2, page 5, Warranty Information, 3rd paragraph. OPERATION & INSTALLATION MANUAL
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