Pentair MasterTemp 400 Review 2019- Pro’s & Con’s

Pentair MasterTemp 400 Review 2019- Pro’s & Con’s

Introduction to Pentair MasterTemp 400

Pentair MasterTemp 400 is a pool heater. It is a bestseller among pool heaters and is among the highest-rated products in the category on Amazon. Pentair is one of the better-known brands, not just for pool heaters but also pumps. It has quite a few leading technologies in its pumps and heaters that are not found in similar products of other manufacturers.

Pentair MasterTemp 400 Overview

Pentair MasterTemp 400 runs on natural gas. The heavy-duty heater works fast and many experts have rated it as one of the top three pool heaters available today. Since Pentair makes several products for pools, including pumps, filters, cleaners, automation systems, lights, and heaters, many people find it easy to sync compatible equipment for easier operations. There are thousands of pool owners who have multiple Pentair products for their pools.

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Pentair MasterTemp 400 Features

There are three variants of Pentair MasterTemp 400. The standard model is 460736. It has a copper heat exchanger. The midrange model is 460805. It has copper and nickel exchanger. This is capable of heavy-duty operations so do not presume the midrange model as incapable of extreme performance. The third variant is 460775. It meets or exceeds the standards set by ASME. It is a durable and much more resistant model due to the metal headers. The midrange heavy-duty variant works well for most pool owners. It can endure weather extremes and challenging applications. It has no issues with slightly acidic water or barely alkaline water. It can also sustain heavy flows over prolonged periods of time.

Pentair MasterTemp 400 is easy to use, mostly due to the control panel. The convenient layout simplifies the operation. The manufacturer claims that the heater needs very little to no maintenance. The digital display on the control panel can rotate so accessing it is effortless. The pool heater does not make any noticeable noise. There are five lights indicating the specific status of the system. The display shows water temperature in real-time. There is a service light indicating when the heater needs a bit of boost. Beyond Pentair, the MasterTemp 400 can work with other applications made by different manufacturers but do check and verify before buying.

The construction of the Pentair MasterTemp 400 is of copper and nickel alloy, also known as cupronickel. The sturdy construction makes it more durable than standard copper. Nickel resists or protects the heater from corrosion. Copper retains ductility. Cupronickel is widely used in marine equipment and appliances as the alloy can endure saltwater. The heater is not very heavy and can work for saltwater pools. Other features include the switch, a spa mode, and temperature control.

Pentair MasterTemp 400 can heat a standard-sized pool with usual depth much faster than other heaters in this class. This efficiency is attained despite consuming more energy. The product is eco friendly and meets the most stringent emission standards. Pentair has really focused on the finer elements as the handles are resistant to rust and can bear weather extremes. They do not get hot after prolonged exposure to direct sunlight. The digital controls are easy. The safety features are also worthwhile. There is a water pressure switch that prevents overheating. There is a safety shut off feature to stop the heater when temperatures breach the maximum factory setting. There is a shut-off valve for manual use. The heater has a stack flue sensor to prevent overheating. The system can be installed on a combustible surface.

Pentair MasterTemp 400 Review

It is one of the sleeker designs in its class. The heater is also among the most durable in the price range. Solid construction, easy access to important controls and the reliability, as well as the efficiency with which the heater gets the job done, are appreciable. There are three variants so pool owners can choose the most relevant model. It is not necessary to go for the most advanced variant if there is no threat of saltwater or other heavy-duty operations. Standard pools can make do with the standard or the midrange variant.

There are a few tricky realities about Pentair MasterTemp 400 but only for those who are not fully familiar with such systems or the pool they own. Not every pool owner is accustomed to the composition or nature of the water, the kind of heater that will be compatible with the setup, the total volume of water that needs to be heated and the desired turnaround time. These are some reasons why pool owners should consult an expert. Those who are not experienced at installing such heaters should also get a technician to do the job. Improper installation, choosing a model that is not suitable for the pool or other discrepancies may pave the way for persistent issues.

Pentair MasterTemp 400 does not need much maintenance but only when the water chemistry is suitable for its optimum functioning. Choosing the heavy-duty model is a wiser decision if anyone is unsure of water chemistry and whether or not the materials the heater is made of will be subjected to challenges they are not supposed to endure.

Pentair provides everything in the carton. The essential documents such as installation guide and manual are there, so is the installation checklist and brochure. There is a diagram with accurate dimensions. The kit contains a bypass access plug and other necessary components. Pool owners who get the water tested and choose a variant of MasterTemp 400 can ensure the heater lasts longer than a decade.

Pentair MasterTemp 400 Pros and Cons

There are several strengths of the heater. Our Pentair MasterTemp 400 review has found the heater to be very effective and efficient. Switching on the heater in the morning, not as early as dawn but two to three hours before diving into the pool will weave enough magic to have a comfortable time in the water. The heater does not consume as much energy as some other models in its class. The installation is simple. During our Pentair MasterTemp 400, we found out there is absolutely no ambiguity as the manufacturer provides all relevant information to get started with the heater. The materials are definitely among its strengths. Durability, reliability and sustainable operation are other strengths. The price may be an issue for a few pool owners. It is a premium heater and has a price tag it deserves.

Pentair MasterTemp 400 Price

Pentair MasterTemp 400 (460736) is selling at around $2300. There is free shipping.

Pentair MasterTemp 400 Customer Reviews

Customers are largely content with Pentair MasterTemp 400. With the exception of some packaging related issues with some sellers, most customers have had no problems with the heater, either while purchasing or later when receiving the package and installing it. Many customers have chosen to hire a technician for the installation. This is indeed recommendable if a pool owner has not installed a heater before or is not very handy with the demands of the process as detailed in the checklist and installation guide.

Water chemistry is not an issue for most pool owners. A majority of pools have fresh water and standard chlorinator is also used across the country. Those who have saltwater pools must not choose the standard model. Those who know their pool water is slightly or substantially acidic should also choose the heavy-duty variant or the topmost model.


During our Pentair MasterTemp 400 review, the heater raised the water temperature by three degrees in an hour. We tested it in a pool with fifteen thousand gallons of water. This is a remarkable efficiency.

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