SKU: 38349086047

APO ECV15/850 15mm 850kPa ECV Expansion Control Valve

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Description

APO ECV15/850 15mm 850kPa ECV Expansion Control ValveOverview The APO ECV15 850 15mm (1 2") 850kPa ECV expansion control valve is used to regulate the water pressure inside hot water services, including heat pumps, electric, gas storage and solar water heaters across all mainstream brands in Australia such as Rheem, Vulcan, Rinnal, Dux, Aquamax, Thermann, Apricus and Solahart. The APO ECV expansion control valve features the same threads, fitments and similar physical sizes with many other valve

Overview

The APO ECV15/850 15mm (1/2") 850kPa ECV expansion control valve is used to regulate the water pressure inside hot water services, including heat pumps, electric, gas storage and solar water heaters across all mainstream brands in Australia such as Rheem, Vulcan, Rinnal, Dux, Aquamax, Thermann, Apricus and Solahart. 

The APO ECV expansion control valve features the same threads, fitments and similar physical sizes with many other valve manufacturers such as Reliance H50, AVG, Tomson, Nefa and Reflex. This makes the APO ECV valve a perfect direct replacement to an existing valve in an old hot water heater. 

The ECV expansion control valve regulates the pressure caused by water volume expansions during normal heating cycles in a hot water service. The ECV expansion control valve relieves this increase in pressure by a controlled water dripping into a drain line typically of 2 to 5 liters per day depending on the hot water usage.

The ECV expansion control valve is color coded and used in conjunction with a matching color coded PTR pressure temperature relief valve of a higher pressure setting in a hot water system. Therefore, the ECV valve is designed to open first before the PTR valve does. Because the ECV expansion control valve is installed to the cold water supply line, this means the cold water is dripped out first, instead of hot water otherwise via the PTR valve. This cold water dripping feature ensures a better safety and promotes energy saving at the same time. The reduced duty cycle on the PTR valve can promote the PTR valve service life span too. 

A functioning ECV expansion control valve is a requirement by law in many Australian states by plumbing authorities for safety. A typical sign for a faulty ECV valve is when there is a large amount of water leakage in a stream, rather than a controlled dripping. The worn out or leaking ECV valve must be replaced immediately. 

An optional ECV valve insulation jacket is available which can reduce the heat loss and improve the hot water services' overall thermal efficiency. 

Engineer's Notes

The small black plastic part opposite the discharge port is called an auxiliary and serves as an emergency fail safe device by blowing itself out in case of a blockage in the discharge drain pipe. However, this auxiliary can become a failure point itself over time by unintended leakage or blow out due to manufacturing defects. The auxiliary is a threaded part and can be easily screwed in/out. The auxiliary can be replaced cheaply, instead of buying the whole valve.

Although a faulty ECV valve itself is the most common cause for excessive leakages, this can also be caused by a faulty or insufficient pressure limiting valve, which regulates the inlet cold water supply pressure from the street mains into the tank. If the pressure limiting valve is faulty and allows excessive pressure into the water system, the ECV can leak when not faulty. In some extreme cases, the local mains street pressure may be so high to a point that the pressure limiting valve can become insufficient to limit the pressure to a typical 500kPa even with no faults. In these scenarios, a pressure limiting valve may need to be replaced or a pressure limiting valve must be used instead to limit the inlet water pressure sufficiently. 

The plumbing codes require the ECV and PTR discharge pipes connected to a nearby drain or roof down pipes, so the discharging water is not directly dripping to the ground. In cases of no or difficult access to an actual drain, a fake drain may be allowed by the plumbing rules by digging a hole on the ground and make up a fake drain using a PVC pipe section. 

Technical Details

  • Brand: APO
  • Model: ECV15/850
  • Watermark License Number: WMK26608
  • Pressure Rating: 850 kPa
  • Color Code: Green
  • Matching PTR Valve: 1000kPa Green PTR
  • Optional Insulation Jackets Available
  • Thread Size: 1/2" BSP (15mm) Male MI thread and female FI thread
  • Thread Size Physical Measurements: 20.995mm external male and internal female thread diameter (refer to the BSP sizing chart in the photo gallery)
  • Expansion Rating: 20 kW 
  • Replaceable Auxiliary 
  • Dry Spring Internal Mechanism with High Temperature Boots and Seals
  • Material: Lead Free DR Brass Valve Body and Stainless Steel Levers
  • Intended Use: Electric tanks, solar tanks, gas storage tanks and heat pumps
  • SKU: APO-ECV15/850 and APO-ECV15/850-I

Package Contents

  • APO ECV15/850 15mm (1/2") 850kPa ECV Expansion Control Valve
  • Package Weight: 300g (350g with the insulation jacket)

Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
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Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 38349086047

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Yasniely Mainegra Ramirez
Houston, US
★★★★★ 5
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Este producto curo mi acné tenía la Cara con muchos granos y este producto me devolvió el alma Gracias Amazon
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Reviewed in the United States on August 14, 2025
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Sabrina K.
Boise, US
★★★★★ 5
Best product I have found!!! Love love love it!!
Color: Picotonic Shot
This product And all the other dr Melaxin products are awesome. I have seen visible changes in my skin and my forehead wrinkles or creases if you will have diminished. I have to creases in my forehead and one between my eyes and ai can’t even see that anymore and he one on my forehead has lightened up and is not as prominent. My skin is visible plumper I am 49 and look like I am maybe 38. I have probably spent thousands of dollars on all kinds of beauty products and none work like these!! Definetly purchase hem I just bought my second bottle. I have only been using this for three months and it deminished the wrinkles in that amount of time. Also get yourself the spicual shot as well it is the pink one it's a micro needling serum and you don’t feel tingly and you don’t get red irritated akin like you do with other micro needling products. Definitely buy all their products. If you do I would get their set of skin care with the serums the cleanser, the turmeric exfoliator,therice exfoliator that is awesome all you do it put a few drops where you have black heads and you rub it into your skin in circles and it pulls out the black heads and exfoliates at the same time. I will never buy another product again their entire beauty line is great they have all you would need for beautiful skin.
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Reviewed in the United States on April 4, 2026
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Noelle
Birmingham, US
★★★★★ 5
Brightened My Skin and Helped Dark Spots
Color: Picotonic Shot, Color: Picotonic Shot
I’ve really liked using the Dr. Melaxin Protonic Shot Serum! The bottle is pretty small, and since I used it twice a day it lasted me about 4 months. But one pump is enough for my whole face. My skin feels very smooth after using it, and I’ve noticed some darker spots becoming lighter over time. I’ve also seen a brighter look under my eyes, which has been a huge plus for me!
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Reviewed in the United States on May 26, 2026
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Brandon
Fort Morgan, US
★★★★★ 5
Works for me
Color: Picotonic Shot
My skin loves this stuff. I haven’t had a pimple since I started using it and my skin looks more even and it’s fading red spots. I highly recommend giving it a try!
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Reviewed in the United States on May 25, 2026
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TVann
Alexandria, US
★★★★★ 4
A bit sticky but tolerable
Color: Picotonic Shot
I have both Dr. Melaxin peel shots in black and white rice and saw immediate improvement in the removal of tiny blackheads trapped in tight pores on my nose and around my lip line. It might honestly not get in very deep but it at least helped my skin, everyone is different. I thought my face could never be that improved by anything other than squeezing the crap out of my face and still getting nowhere. So I thought I'd try more of the product line. With this particular product I'm still too new to judge much but on my particular skin it is a bit sticky so I'll use it at night. I wash with the Dr. Melaxin Melting Cleaser, the Cactus toner, then the Dr.Melaxin Cemenrete Cyano Pink Spicule Serum and then this product. I'm 57, I don't have acne issues but I do have a few hyperpigmentation spots if like to fade out a bit if possible and just improve the overall cleanliness and look of my skin. Nothing is a miracle but it's been a noticable improvement so far. I give it 4 stars primarily due to it being kind of sticky on me. One drop goes a long way FYI.
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Reviewed in the United States on February 24, 2026

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