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if your caravan or motorhome has a noisy header tank pump that drives you crazy and wakes you up? You can upgrade to an in-line circulation pump (3020-049) that is virtually silent. (around £150-£200) I replaced mine on a Swift 580 and this also required the Alde rubber S-shaped hose (1900-530) £18 delivered from Leisure shop Direct. (this shop has everything you need and offers a 10% discount for Caravan club members) I followed this guide from SCP1959 on "Caravan talk" forum (Steve) which is worth its weight in gold... "After speaking to Phil at Alde, I ordered the Alde 12v circulation pump, 1900-530 Rubber S-Shape hose with clips and a header tank cap blanking insert. The parts arrived quickly from Leisure Shop Direct who gave me a nice 10% discount on their already significantly lower prices for being a member of the CAMC. I also bought some 20-25mm rubber bungs to plug the pipework during dismantling. At this point, I would definitely recommend doing this job with the system drained down. Having recently had my system drained and refilled with the 5 year G13 Glycol mix, I decided to go ahead without draining down. I used clamps on all of the rubber pipes on and near the boiler but even with bungs I managed to lose a about a litre of Glycol mix. Fortunately, I'd anticipated leakage and had a shallow bowl, plenty of old bath towels and kitchen roll to catch any liquid to hand. I also had my 22mm pipe cutter handy. This job would take about an hour to complete on a drained system. It took me two hours, carefully clamping and plugging. The job itself is straightforward. Remove the existing rubber elbow and aluminium pipe on the boiler return which is connected to the rubber elbow on the radiator downpipe elbow. Ultimatelely I did have to remove the downpipe from the radiator itself because the 22mm aluminium pipe in that section had to be shortened by about 2" or 25mm to match up with the S bend hose. The aluminium pipe, hidden in the picture, is removed completely. Using the pipe cutter which cost about a fiver from Amazon (hacksaw not recommended) I cut a piece from this pipe measuring approx 3" or 75mm to join the S bend hose attached to the pump to the elbow hose on the shortened downpipe from the radiator. The pump was then connected to the boiler's circuit board. The pump connector has two holes, the circuit board has four pins. When looking at the board the connector fits onto the two left hand pins with the securing lever on the plug facing downwards. I then double checked that all the heavy duty hose clips were correctly positioned and I've got to say, they caused me more grief than anything else. I then removed the impeller pump from the header tank, fitted the blanking insert into the cap and topped the tank up with 50/50 mix of Glycol and de-ionized water but left the cap off the tank. Finally, I set the new pump to setting 5, turned the Alde control panel on, scrolled to 'Installed Accessories', deselected "Optional Pump" and selected "Remote Main 12v Pump". I then selected gas input, cranked the temperature up to 30 degrees. held my breath and crossed my fingers. A quiet click was heard and the water in the header tank started to churn. The pump was working . ..RESULT! On the advice of Alde Phil, I left it running until the Glycol temperature rose to 80 degrees, by which time the caravan was like a hot house. The temperature is viewed in the 'Service' section on the Alde control panel. I then checked the bleed screws on the towel rail and on the radiator above the boiler. Very little air came out because most of it was purged via the header tank by the force of the pump on setting 5. When I satisfied myself that there were no leaks and all was working as it should, I turned the boiler off, fitted the cap onto the header tank and turned the pump down to its recommended setting of 2. A very satisfying job but, very hard on the knees and back due to the confined location of the boiler. I've also got several cuts on the back of my hand from the sharp fins on the aluminium radiator fitted opposite the boiler, caused when my grips slipped off the hose clips.  However, I have to say the pump is virtually silent so, here's to undisturbed nights sleep." I apologise for all the "errrs" in the video and wrong terminology but watching the video may just give you a better idea of what to expect. Also I forgot to say to turn the pump back down to around 2 once the air has been flushed out. I am not a professional nor claim to be, so please don't ask any technical questions about the upgrade. just hope it helps someone on their own installation.