MF200 PRESSURE PAL Hydronic Mini System Feeder (6 Gallon) Zoom

MF200 PRESSURE PAL Hydronic Mini System Feeder (6 Gallon)


Brand: Axiom

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Capacity (Gallons): 6
Power Supply: 115V (ac)
Hertz: 60
Discharge: 1/2" FPT
Cut-Out PSI: 15 psig
Pump Rating: .7 gpm
Height (Inches): 16
Width: 11-3/4"
Features: Self-priming up to 4 Feet

Description for Axiom MF200

The PRESSURE PAL is ideal for feeding and pressurizing closed hydronic systems that do not require cold static fill pressures higher than 25 psig. It is compatible with both water and glycol/water solutions. Perfect for small boiler/chiller systems, snow/ice melt circuits, outside air heating/cooling glycol coils, solar heating systems.


  • 6.0 US gallon (22.7 liter) tank for storage and mixing
  • Power supply plugs into any standard 115 VAC outlet
  • Diaphragm pump can run dry without damage
  • No direct connection to potable water supply eliminates need for backflow prevention
  • Make-up fluid stored in the feeder tank can be pre-treated
  • Diverter valve allows easy purging of air on initial start-up, and manual agitation of solution
  • Prevents major floods - in the event of system rupture, only the contents of the tank will be pumped into the system
  • Provides leak detection - dropping fluid level provides immediate notice that the system has developed a leak
  • Fluid drained for service can easily be put back into the system
  • Fluid level switch shuts the pump off if the storage tank level gets too low
  • Auxiliary dry contact included for remote low pressure alarm (alarm optional or by others)

MF200 PRESSURE PAL Hydronic Mini System Feeder (6 Gallon)


by PowerReviews
AxiomMF200 PRESSURE PAL Hydronic Mini System Feeder (6 Gallon)

(based on 3 reviews)

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Reviewed by 3 customers

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I would buy this product again


from Gunnison, CO

Verified Buyer

Comments about MF200 PRESSURE PAL Hydronic Mini System Feeder (6 Gallon):

I use this product on boilers that are feed from a well system, I don't need to worry about water quality or the feed valves and back flow preventers from corroding.


A good product for th price.

By Bob

from St Albans, VT

Verified Buyer

Comments about MF200 PRESSURE PAL Hydronic Mini System Feeder (6 Gallon):

I bought this product for a gycol filled radiant system in a new construction seasonal home.Hook-up was very easy and gage pressure reads a steady 14 PSI which is ideal. One of the mounting screws that holds the gage block mounting bracket had fallen out (and was loose in the box) but that was an easy fix.Overall, no complaints.

(2 of 2 customers found this review helpful)


Does the job

By ZFMax

from Idaho

Verified Buyer

Comments about MF200 PRESSURE PAL Hydronic Mini System Feeder (6 Gallon):

I recently purchased a house with hydronic heat. It had been sitting vacant for some time, and upon firing up the boiler for the first time in who knows how long, I was fighting issues with air in the system. I could charge it to 15psi with water, but within a week or so the charge would be low and a lot of foam had come out the resorber, which then turned to liquid in the bucket that was catching it.My local HVAC guy told me that it's not unusual for this to happen until you get all the air out. But it went on for several weeks and about 5 gallons of glycol mix had come out the resorber. I started thinking there was a problem. It also prevented me from going on a trip or anything during cold weather because the thing needed weekly attention.I decided to get an Axiom MF200 just to keep it charged for me until I could figure out what was wrong. I also wasn't comfortable pumping water into the system and diluting the glycol and raising it's freezing point, so I figured the MF200 was useful just to give me a method to put glycol in the system instead of water.Well, by the time the MF200 showed up, wouldn't you know it, the system started holding it's charge. It had gone 2 weeks and only lost about 3psi and had stabilized and wasn't losing any more. I went ahead and hooked up the MF200 and pumped about 6 psi worth of glycol into the system using it, and it worked fine, but I didn't actually need the thing after all. Oh well, it does give some peace of mind knowing it'll keep the system charged.Although t works okay and I'm generally satisfied, I do have some gripes about it:1) [...] it was missing it's instructions. Fortunately Pex had the instructions available for download on their site.2) It's set for 18psi as delivered, which is 3psi above the pressure my HVAC guy recommended for me. I found the pressure adjustment screw mentioned in the instructions, but it was near the low end of it's adjustment range. I was able to get it down to about 16psi is all. It's probably OK, but keep this in mind if you run a low pressure system.3) The unit has a float in it that keeps the pump from kicking on if the level is low. I'm not sure how it works, it's a electric switch device of some kind, dangling from a wire. In any event, this sensor won't let the pump run unless there's probably 4-5 inches or so of liquid in the tank. That effectively reduces it's capacity by more than a gallon.Suggestion to Axiom for improvement: put a bung on the top of the tank to allow attachment of a hose from the resorber, so that foam out the resorber is automatically recaptured.One very nice thing about the unit is that it gives instant feedback about the level. I used a marker to put a little line on the side of the tank at the fluid level and it gives me peace of mind that I have no leaks in my system, because the fluid stays at that level. If I ever develop a leak I'll know right away.

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  • MF200 PRESSURE PAL Hydronic Mini System Feeder (6 Gallon)


    Can i install this product on an existing hydronic system without removing the backflow valve and pressure regulator (which is set for 14 psi)? The system is currently fed by a well (about 50 psi) that has less-than-ideal water.
    Asked on 10/20/2014 by Greg

    1 answer



      Not sure why you would want to keep the pressure valvein the line? Big
      benefit of this setup is the insurance you get of not fkooding your house.
      Imagine a line burst when not home and the well just pumps water in to your
      house. This system will maintain back pressure and eliminate the risk.

      Answered on 10/20/2014 by Anonymous
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