StoreDeal.ai store
Shop
  • Deals
  • Deal checker
  • Black Friday
  • Buying guides
  • Brands
  • Stores
Travel
  • Flight deals
  • Hotel deals
Company
  • Research
  • Press
  • Use in AI assistants
  • Contact
  • deal.ai apps
Black Friday 2026
  • Walmart
  • Best Buy
  • Target
  • TVs
  • Laptops
  • Headphones
  • Apple
  • Gaming
  • Vacuums
  • Kitchen
  • Toys
  • Smartwatches
  • Tablets
  • Furniture
  • Mattresses
© Deal.ai Inc.·2222 Ponce de Leon Blvd, Miami, FL 33134·support@deal.ai
TermsPrivacy
Deal.ai › Pentair
Pentair
Pentair MasterTemp 400 Natural Gas Pool Heater

Pentair MasterTemp 400 Natural Gas Pool Heater

Best price now

$3,499.99at Hydropool.comChecked 2 h ago

16% under what the other stores charge

Compared across 13 stores. Prices are checked against each store and labelled with when.

Visit Hydropool.com

Ask our agent about this product

It checks today's price at every store, compares the alternatives and answers in about a minute.

Enter to send, Shift+Enter for a new line

Price facts

  • Lowest price today: $3,499.99 at Hydropool.com (checked Nov 14, 2026).
  • Checked at 13 stores.

Our take on the Pentair MasterTemp 400 Natural Gas Pool Heater

The Pentair MasterTemp 400 is a natural gas pool heater rated at 400,000 BTU, built to bring a pool or spa up to temperature quickly. It uses a compact, rustproof cabinet, a rotating digital display and indicator lights for easy monitoring, and it is certified for low NOx emissions. It suits owners of medium to large in-ground pools who have natural gas service and want fast heat with low running noise. Against its main rival, the Hayward H-series, it is quieter and more compact, but its plumbing does not line up as a direct swap for a Max-E-Therm.

Best forMedium to large in-ground poolsSpas and hot tubs needing fast heatOwners with natural gas serviceQuiet poolside settings
Pros
  • 400,000 BTU heats a pool fast
  • Low NOx certified
  • Quiet operation
  • Compact rustproof cabinet
  • Rotating digital display and indicator lights
  • Manual gas shut-off for service
Cons
  • Fittings do not bolt straight onto a Max-E-Therm
  • Display cover can be hard to read
  • Requires a gas line and venting sized for 400,000 BTU

Pentair MasterTemp 400 Natural Gas Pool Heater prices at every store

  • Pool Cleaning PartsNew

    In stock

    $3,699.99Free shippingChecked 2 h ago
    Visit Pool Cleaning Parts
  • PoolstoreconnectNew

    In stock

    $3,989.00Free shippingChecked 2 h ago
    Visit Poolstoreconnect
  • Doheny'sNew

    In stock

    $4,789.00Free shippingChecked 2 h ago
    Visit Doheny's
  • Hydropool.comNew

    Availability unknown

    $3,499.99Checked 2 h ago
    Visit Hydropool.com
  • Pool Supply DepotNew

    Availability unknown

    $3,639.00Checked 2 h ago
    Visit Pool Supply Depot
  • PoolSuppy4LessNew

    Availability unknown

    $3,869.00Checked 2 h ago
    Visit PoolSuppy4Less
  • PoolZoom.comNew

    Availability unknown

    $4,127.99Checked 2 h ago
    Visit PoolZoom.com
  • BestPoolShop.comNew

    Availability unknown

    $4,186.00Checked 2 h ago
    Visit BestPoolShop.com
  • AmazonNew

    Availability unknown

    As an Amazon Associate, Deal.ai earns from qualifying purchases.

    $4,499.00Free shippingChecked 2 h ago
    Visit Amazon
  • Indigo Pool Patio BBQNew

    Availability unknown

    $4,510.00Checked 2 h ago
    Visit Indigo Pool Patio BBQ
  • Vita Pool SupplyNew

    Availability unknown

    $4,549.99Checked 2 h ago
    Visit Vita Pool Supply
  • Inyo Pool ProductsNew

    Availability unknown

    $4,659.99Checked 2 h ago
    Visit Inyo Pool Products
  • Poolshop.comNew

    Availability unknown

    $4,789.00Checked 2 h ago
    Visit Poolshop.com

Store links may earn us a commission.

Pentair MasterTemp 400 Natural Gas Pool Heater price history

Lowest price we've seen: $3,499.99 on Nov 14 at Hydropool.com. Tracked across 13 stores since Nov 14.

What reviewers say

Owners say the heater works well and heats quickly, and several note easy installation where the piping matched up. Complaints center on the display cover being too dark to read and on plumbing that does not line up as a direct replacement for a Max-E-Therm.

What people mention
  • Heating speedPraisedOwners say it brings the pool up to temperature quickly.
  • NoisePraisedReviewers describe it as quiet at the poolside.
  • InstallationMixedEasy to install when the piping matches, but the fittings do not line up as a direct Max-E-Therm replacement.
  • DisplayCriticisedThe display cover is too dark to read the numbers easily.
  • ReliabilityPraisedBuyers report the heater works great with no functional issues.

From Pool Cleaning Parts

  • Heats up fast so no long waits before enjoying your pool or spa
  • Best-in-class energy efficiency
  • Manual gas shut-off when service is required
  • Certified for low NOx emission and outperforms industry standards
  • Rotating digital display allows for easy viewing
  • Tough, rustproof exterior handles the heat and weathers the elements
Guarantee
Brand new from the manufacturer; 60-day parts warranty for homeowners when purchased online, or 2-year warranty from Pentair for pool professionals' customers.
Shipping
Free shipping and no sales tax; ships freight truck (2-5 days).

About the Pentair MasterTemp 400 Natural Gas Pool Heater

The Pentair MasterTemp 400 is a natural gas pool heater with a heating capacity of 400,000 BTU. It heats a pool or spa quickly. It is built with a compact design and runs quietly.

Operation is similar to a home heating system, and indicator lights help with operation and monitoring. A manual gas shut-off is provided for when service is required.

The exterior is rustproof and made to handle heat and outdoor weather. The heater is certified for low NOx emissions and outperforms industry standards.

Heating capacity
400,000 BTU
Fuel type
Natural gas
Emissions
Certified for low NOx emissions
Display
Rotating digital display
Indicators
User-friendly indicator lights
Shut-off
Manual gas shut-off
Exterior
Rustproof
Brand
Pentair

What buyers say

Buyers like
  • Heater works great
  • Smooth, on-time delivery
  • Unbeatable price and fast shipping
  • Easy installation with piping matching right up
  • No functional issues with the heater
Buyers complain about
  • Order hadn't left the warehouse by the promised delivery date despite a tracking number
  • Fittings are 1½ inch off from being a bolt-on replacement for a Max-E-Therm
  • Display cover is too dark to see the readings

Specifications

Heating Capacity
400,000 BTU

Questions and answers

How big a pool will the MasterTemp 400 heat?
At 400,000 BTU it is sized for medium to large in-ground pools and spas. Actual heat-up time depends on pool volume, cover use and air temperature.
Does it need a special gas line?
Yes. A 400,000 BTU natural gas unit needs a gas supply and venting sized for that input, so have a licensed installer check your line before buying.
Is it a direct replacement for a Pentair Max-E-Therm?
Not bolt-for-bolt. Owners report the fittings sit about 1½ inches off from a Max-E-Therm, so expect plumbing adjustments.
How loud is it?
Pentair markets it as super quiet, and owners describe it as quiet at the poolside. It still needs clearances for airflow and venting.
What is included with the heater?
The heater itself with its digital display and manual gas shut-off. Gas piping, venting and installation parts are supplied separately by your installer.
Is it low-emission certified?
Yes. It is certified for low NOx emissions, which matters in areas with air-quality rules for gas pool heaters.
Where is the Pentair MasterTemp 400 Natural Gas Pool Heater cheapest?
At Hydropool.com, for $3,499.99, 16% under what the other stores charge, as of our latest check.
What do buyers say about the Pentair MasterTemp 400 Natural Gas Pool Heater?
Buyers like: Heater works great; Smooth, on-time delivery; Unbeatable price and fast shipping. Common complaints: Order hadn't left the warehouse by the promised delivery date despite a tracking number; Fittings are 1½ inch off from being a bolt-on replacement for a Max-E-Therm.
Where can I buy the Pentair MasterTemp 400 Natural Gas Pool Heater?
13 stores we checked sell it, including Hydropool.com, Pool Supply Depot, Pool Cleaning Parts, PoolSuppy4Less, Poolstoreconnect.

More from Pentair

  • P
    Pentair UltraTemp 140 H/C 140,000 BTU Heat Pump
    Pentair UltraTemp 140 H/C 140,000 BTU Heat Pump
  • P
    Pentair Mastertemp 400K BTU Heater Natural Gas 460736
    Pentair Mastertemp 400K BTU Heater Natural Gas 460736
  • P
    Pentair MasterTemp Pool Heater 461061
    Pentair MasterTemp Pool Heater 461061
  • P
    Pentair UltraTemp High Performance Pool Heat Pump 140 460934
    Pentair UltraTemp High Performance Pool Heat Pump 140 460934
  • P
    Pentair Mastertemp 250K BTU Heater Natural Gas 460732
    Pentair Mastertemp 250K BTU Heater Natural Gas 460732
P
Pentair 460958 UltraTemp 140 H/C Pool & Spa Heat Pump
Pentair 460958 UltraTemp 140 H/C Pool & Spa Heat Pump
  • P
    Pentair GulfStream Pool Heat Pump 142K BTU 208/230V
    Pentair GulfStream Pool Heat Pump 142K BTU 208/230V
  • P
    Pentair UltraTemp 120Q Heat Pump Quiet 125,000 BTU
    Pentair UltraTemp 120Q Heat Pump Quiet 125,000 BTU
  • All Pentair deals and products →

    More pool heaters

    • B
      Bestway Solar Heating Pad
      Bestway Solar Heating Pad
    • E
      Electric Pool Heater 30000 BTU with WiFi Control
      Electric Pool Heater 30000 BTU with WiFi Control
    • I
      Intex Solar Water Heater Mat
      Intex Solar Water Heater Mat
    • V
      VEVOR Pool Heat Pump with WiFi App Control
      VEVOR Pool Heat Pump with WiFi App Control
    • C
      Costway 70000 BTU Pool Heater
      Costway 70000 BTU Pool Heater
    • J
      Jandy JXi 400,000 BTU Natural Gas Pool Heater
      Jandy JXi 400,000 BTU Natural Gas Pool Heater
    • R
      Raypak 406A 399,000 BTU Natural Gas Pool Heater
      Raypak 406A 399,000 BTU Natural Gas Pool Heater
    • V
      Vruelia 2000W Pool Heater Electric Water Heater
      Vruelia 2000W Pool Heater Electric Water Heater