The function of the Caleffi 553542A is to automatically fill and regulate the pressure in a hydronic system to a pre-set value. Water flow to the system will automatically stop when the pre-set value is reached and fill up with more water if required.
Very accurate, stopped excessive relief valve blow-off
Tried many boiler feeds and this is the only one that stopped relief valve from blowing due to inaccurate feed pressure. Includes internal shutoff valve and pressure gauge port. Gauge was not needed as pressure set calibration is very accurate. The only drawback is that you need a radiator spud wrench to attach fitting to input, which seems weird and unnecessary.
VS
Most Liked Negative Review
Don't buy
Unlike other autofill valves, there is no way to really hold the high pressure end tight to screw a nipple into it. It has a union for easy replacement but that is simply going to turn when you try to screw a nipple into it
Showing 1-10 of 10 reviews
Don't buy
Unlike other autofill valves, there is no way to really hold the high pressure end tight to screw a nipple into it. It has a union for easy replacement but that is simply going to turn when you try to screw a nipple into it
Paul
Colorado mountains
9 months ago
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Exact replacement
Being able to get replacement parts is #1 in servicing equipment. In less than 48hrs. The part arrived and replaced. Great service.
High Pockets
New Lisbon, Wisconsin
2 years ago
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Perfect Reducing Valve
Just changed this valve after 10 yrs of use - otherwise it was working swell all those years. Highly recommend as it is easy to turn the knob on bottom and to me it is the top of the line product.
Erwin
KS
4 years ago
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I would buy again, however it would be the one with a guage.
Used on a home boiler system. Works as advertised. I just thought the dial setting face was a gauge and was not. Installed a gauge and now is perfect.
wolfman
peoria IL
4 years ago
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Very accurate, stopped excessive relief valve blow-off
Tried many boiler feeds and this is the only one that stopped relief valve from blowing due to inaccurate feed pressure. Includes internal shutoff valve and pressure gauge port. Gauge was not needed as pressure set calibration is very accurate. The only drawback is that you need a radiator spud wrench to attach fitting to input, which seems weird and unnecessary.
kwassa
Boston MA
5 years ago
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Reliability and Quality
Well designed, very reliable and high quality. Precise adjustment eliminates problems with pressure balancing. Includes integral stop valve and pressure gauge port. The only caveat is that you will need a spud/radiator wrench to attach to the proprietary input fitting.
kwassa
Boston MA
5 years ago
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It was good product ,good prices, and good service
Home use and you get good price.
Magic Mark
Clare mi
6 years ago
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I would buy this again
The product works as advertised.And the adjustable setting dial makes setting the correct pressure easy.
do57
Berwick,Pa
8 years ago
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great product
easy inline installation easy adjustment
worked very well on new multi boiler project
don
kittanning,pa
10 years ago
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Very accurate !
This valve solved a minor problem with my Baxi Boiler. Easy and effecient way to keep the heating system at the reccomended water level.Workes like a charm
Plumbingman
Denver,Co
12 years ago
Verified Buyer
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