I have also experienced a Bolin pump failing after 2 seasons. My replacement (24-volt) Bolin, purchased from Kuranda is now showing signs of failing, with water leak stains down the outside of the casing.
Like (nb.Bream owner), I too wrote to Bolin directly. I had good positive and helpful replies from them. (The price Kuranda want is over £130, or so. I understand and Bolin will repair! ~See Below~ One of the technical staff replied saying that because we do not have the severe winter weather that Sweden experiences, the water in central heating systems did not have anti-freeze added and the "rust" and other small particles that comes off the steel radiators, tend to wear the seal around the shaft of the impeller. They recommend "Please try to add ## Propylene glycol ## to your system" Can anyone advise please? Is antifreeze with ## Ethylene Glycol ## the same as the above, or does it have the same basic make-up, presumably to stop corrosion of Alloy and Steel components? I initially used "Fernox". This is popular in standard house central heating systems. It has been in my system for far too long and it's useful life has probably expired by now! I use "Long Life" Antifreeze in my car and boat engines and it has EG in it. The spec. says dilute on a 50/50 ratio. Advice is possible please, so that I can put the "best" stuff in my C/H before the winter arrives. ~Allan~ PS: FOR THOSE INTERESTED a part copy and paste is below, with direct replacement costs, including postage, received yesterday from Bolin: EX>Bolin E-Mail< Hi Sorry that you have had problems with your pumps! First of all, the Bolin Pump is repairable! We can help you! We charge SEK 225 plus the parts that have to be replaced. Total maximum SEK 600. A new pump will cost you SEK 1485 from us. We also have to charge you for the freight.. If we send the pump as ?a large letter? the cost is SEK 100 and as a package SEK 265.(Letters can not be tracked if they are lost) I would like to know if your system is under pressure, which could be the reason for the leaking. Also the impeller are extreme sensible if it is crooked so the sealing doesn?t work.
