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Discuss Hydraulic system test in the Central Heating Forum area at

  1. robj20

    robj20 Member

    How long is it wise to leave a system before filling it up, after you have wet tested it as obviously it will stay wet throughout with untreated water?
  2. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    Once you finished all your tests you can fill straight away if you want and then flush and clean the system, then add your inhibitors if it's a heating system
  3. robj20

    robj20 Member

    I was more concerned with say testing it then leaving it empty for a week or more.

    How fast does corrosion set in before final flush and filling.
  4. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    Are you going to flush / clean the system if yes leave the water in
  5. robj20

    robj20 Member

    I was going to test the system, then using the old central heating pump have some fernox f4 to clean any fluxes residue. Then drain and wait a few weeks for the gas bloke to fit the new boiler.
  6. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    He will need to flush and clean it once he's installed the boiler anyway
  7. king of pipes

    king of pipes Trusted Plumber GSR

    I would of leave it full after you have chemically cleaned the system and let the installer drain down to replace your boiler cheers kop .
    • Like Like x 1
  8. justlead1

    justlead1 Trusted Plumber GSR

    Your post is of interest and i will hopefully reduce the fear factor. In about 1975 i was involved in the building and P & H installations on 11 properties, one of which i dwelled. The P & H was a standard two pipe system with 13 rads and gravity flow and return to cylinder, both feed by cisterns in loft. The boiler being an 80.00 BTU idea gas, no additive were used. I when back to the road just a few months ago to reminisce, and meet a pal that still live in one of the houses. We had built them together, during tea and biscuit we jawed. It appears the P & H system had not been altered, all the same as when fitted (other than too rads that were changed for cosmetic reasons) and no problem encountered. Now i'am and was standard turn it into cash plumber. With the MEC trades its been notice there money to be earn't and many scientists and component manufactures have joined the grave train.
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