Hi guys. My gas engineer is coming to service my boiler in a couple of weeks. Last year he added Fernox F4 Express leak sealer into the boiler which works well. He set boiler pressure to 1.5 last February and it dropped to 1.3 shortly after but has stayed at 1.3 which is fine. Before using Fernox it kept going down and down and I had to keep repressurising the boiler.
I'm just wondering if it's just as easy for him to add the regular non Express F4? I only ask because it's a little cheaper to buy. Or would he be like "no you should have bought the Express version".
Fernox F4 Express Leak Sealer 400ml - Screwfix
Order online at Screwfix.com. For use in domestic heating systems for sealing small inaccessible leaks. Quick and convenient, doses in only 30 seconds. Works best in warm / hot circulating water. Once dispersed evenly in the system water it is effective within 1-24 hours. The sealing efficiency...
www.screwfix.com
I'm just wondering if it's just as easy for him to add the regular non Express F4? I only ask because it's a little cheaper to buy. Or would he be like "no you should have bought the Express version".
Fernox F4 Central Heating Leak Sealer 500ml - Screwfix
Order online at Screwfix.com. Internal leak sealer developed for use throughout a central heating system to seal microscopic, inaccessible leaks and weeps which may cause pressure loss and boiler breakdown. Saves time and money on draining down the system and repair costs. Does not cause...
www.screwfix.com
Last edited:
