tomcoleman

not sure how that would differ from what i already have.?

So i wanted to circle back to this topic and my orginal post/install back from 2021 its been almost 3 years with running the system. My overall thoughts was it worth investing in this system for £3-4k i would say no. Heres my reasons(s) why 1) Support from greatwater / friendly water - They choose which emails to reply to support seems limited and after sales care / dealing with questions feels like they arent really intrested. 2) the orginal video of the demo of water BLASTING out of showers isnt what ive seen its nothing like "blasting out" most likley this demo was setup on larger pipes / higher pressure 3) it added about 20-30% better pressure/flow to my house which is all 15mm with 28mm delivery. If you still flush a toilet even with the accumlator fully charged you can see pressure drop. I feel abit cheated in what i was sold its not a 100% soultion more like a band-aid. When i asked about having hotel pressure i was told to buy another unit, my issue isnt water storage its pressure delivery, even if i adjust the PRV pressure/flow rate just doesnt come from the boost-a-main for long. I'm thinking about ripping the system out and installing a pump and header tank now.

i was also concerned about weight as mega flow is next to vessel in the end it was on a load bearing wall and joist are new and thick, builder said it was ok so did it, been fine ever since.

ive been emailing the manufacture for weeks on how to set the pressure via the pump. Theres no controls and says its "pre set" act factory i presume if i took the cover off there would be some type of USB connector but would need the software to adjust. Out the box its set to come on and charge at 4.0bar and switch off at 6.0bar thus storing 6bar of pressurized water in the vessel. The pressure drops rapidly from the vessel, for example on a full charged (charged to 6bar) if i have a shower for around 5-8mins it will drop below 4 bar then pump will turn on and try to start charging the vessel again if im showing in the window when the timer plug for the pump is on.

shower performance has gone up by around 30% my PRV is set to 3.5Bar the mains comes in from the street via a MDPE pipe which then goes into 28mm copper which then feeds directly to the accumulator pump. The pump then pressurizes the black storage tank (as seen in photo) upto 6bar. The pump is on a timer and set to come on 3 times a day (as its noisy even with damper matts and sound proofing) It has made a difference as i said around 30% but its not worth the £3000 it cost. The pressure of the storage vessel drops very quickly im trying to speak to the manufacture to see if it can be set to go upto 7-8bar so i have more pressure for longer. On the top floor shower i renewed the pipe work from 15mm to 22mm this made no difference as the thermostatic mixer i guess still reduces everything to 15mm. Dont get me wrong the shower "feels" stronger i just wish it lasted longer, in the rest of the house no real major difference on taps etc

ok boost a main all installed. Mains in which is MDPE goes into 22mm copper with a check-valve, this then goes into 22mm>28mm into the inlet of the pump. From the pump i have a 28mm > 28mm connection to the accumulator tank. The outlet of the pump is then 28mm out reduced to 22mm which connects onto existing 22mm PRV which then goes off to feed megaflow and balanced cold. Pressure on PRV gauge used to be 2-2.5bar and now reads 3.5bar (this is what i set it to)

from my understanding the shower will be fed from the accumlator and when that depletes it goes back to mains. As the accumlator is pushing out to the megaflow at (whatever bar is set ) and when empty its flow & pressure is no more so mains takes over. Mind you i have gone for a 300L version so should hold more then enough water for showers.... I'll let you know how i get on. I dont know what pressure drop i get all i know is mains in is 2bar and showers arent dribbling they just arent lovley.

I had a guy come over from boost-a-main to have a look, wasn't a sales guy more technical and talked me through some options, i also discussed some other products on the market. My internal plumbing is mainly John-Guest 15mm, i have a flow device which showed my taps pushing around 8lp/m which is rubbish and a inbound street static pressure of 2bar. Im going to fit the kit myself im a DIY'er and its not that hard, couple of connectors etc. The pump will then pressurize the unit and i can adjust the output to the unvented megaflow which should be an opertional bar of 3bar but i'll do 3.5 to account for 0.5 loss of transport. I should have this kit in april so can always report how i got on. on 15mm pipe the max flow rate is 18l/min so more then enough,.

sorry mate - not enough coffe inside me !! HAHA im going for accumlator + pump to increase pressure. i did increase the pipe from the road already to MDPE but made no difference.

The pump charges the accumulator though up to 6 bar....?

i also put in MDPE pipe in replacing the mains into the house direct into the water supply off the road, made no differnce. mains into house is 2bar.

placed my ordered todo for a Provess 440H and a Boost-A-Main MSP10 pump will let you know how it goes. Over £3k of kit ! ?

just an update - everything is working perfectly and all 7 ports are balanced perfectly!! done the job, leave them on for like 60-90mins come back and volla! sorted!

ok it might be fixed!! i read somewhere to leave it on for 60mins "calibrating" and not the 20mins the manual says. So far this seems to have worked and the valves are now open and everything is balanced at 2l/m

everything working as it should. just valves close and stay closed. clips are 10cm as per manual - not sure they have a way around to go ?

sorry forgot to post the sequence of what happens.

yes 240v into the control box, LED's green, Voltage going to the actuators, which move (open/close) and RED LED's lit.

yes, my control panel is wired to be always on giving 24/7 power to the Actuator's.

so i got the units installed buy having a nightmare with them. all 7 actuator's are linked into the KL08NSB controlbox which is powered by 240v mains. The all come on and powerup fine, no issues. On first setup as per the manual heating was switched on, actuator's was then powered on and LED's ontop began to blink (i presume this was calibration phase) i left it for around 30mins. During this time the actuator's closed, opened then closed (their boot up sequence) and remained closed. They basically will not open or balance the pump is on, boiler is on heating and i can see the temp rising on the probe and worried it will burst or something if gets stupid hot, which it is because the valves are all fully shut and pump is trying to push water around the circuit. any ideas on what i can do ? i took a video of the boot sequence here you can see at the end they all fully shut and stay shut.

outside tap is on the side of the house (ground floor) unvented tank is on the top floor (3 floors up) so pressure reading on the outside tape would be a false reading? I think i need to change the PRV over and then get the mains pressure reading in at the loft where it then enters the unvented tank. nick can you explain what you mean by pump set? so far from what my little brain can understand is i either put an accumlator next to the megaflow in the loft (pumped version) max 200L or connect a pump somewhere directly? is that right? Im not sure on the latter as i thought you cant connect pumps to a unvented megaflow type system as it could explode or collpase in on itself, or is the pump set you mentioned something different? please see my 3 links on the first post these are the ones / systems i have been looking at. ahh mines unvented with megaflow type tank. correct. the flow is this. Mains street pipe comes into house and upto loft, which goes from MDPE to copper into the PRV (as photo shows cold mains is coming from the right in that picture) mains > PRV > PRV to megaflow (reduced 3bar) the other ports on the PRV go to a expansion vessel and then theres a cold return loop. I have a feeling i need to swap over the PRV with 2 guages to then see what mains pressure in is (at 3 floors high) and what pressure is being delivered to the megaflow tank in the loft. I presume with such a high run to the loft the head pressure is shite which is effecting the rest of the system. I have a horizontal megaflow tank i do have space for a accumulator but max around a 200l version which i could site next to the megaflow tank.

i have opened up the PRV and strainer which was clean. I have adjusted the setting on the PRV but seems it was already on max (3bar) and has made no difference

going to try and swap out PRV with a pressure gauge version

looks interesting - was this installed on a unvented system ? Is pressure on shower strong ? what's it like or just normal if you can expand on this would be great

thanks guys, my PRV doesn't have a pressure hole for some reason so i would need to swap that over to a version that does. attached is my PRV any ideas on what model to replace with ? on the other side is another port which goes off to a mini expansion vessel

hi i have a unvented system in the loft, mains into the house is MDPE PIPE BLUE 25MM this goes into a PRV and then onto the unvented tank. My pressure is not very good, unfortunately my PRV doesn't have any gauges so i cant tell what pressure is in/out but when showering its low pressure. I have been looking at 3 systems to boost the pressure. 1. Boost a Main (19) Boost A Main Power - YouTube Home | Boost-a-Main 2. Stuart Turner (pumped) Mainsboost MB 200SH-1-22 | Hot Water Cylinder | Stuart Turner (stuart-turner.co.uk) 3. Salamander AccuBoost Accumulator Tanks | Salamander Pumps Mains Booster Range all 3 seem to use a accumulator that is pumped, the pumped part seems to be the main difference with Boost a main on the youtube video looking really powerful. Does anyone run any of these systems on a unvented system, does it really increase pressure much?? any help of advice would be great