Browse Forums Heating, Cooling & Insulation Re: continuous hot water with shower mixer 7Oct 02, 2019 11:07 am BBJ Thanks for your replies everyone! Sounds like its more confusing than I thought LOL Hi BBJ, It is a bit more technical I guess than just picking a 'big' enough HWS unit. But from what I have been told and researched, your 26-27L rated instant gas units will be more than enough in terms of their ability to produce enough hot water for two 7.5l/m shower heads. The main issues might be:
Hope this helps? So basically installing just a large enough unit doesn't guarantee you can run both your showers with no noticeable pressure or hot water loss unfortunately. --------------------------------------------------------------------- Check our Homeone build blog here Re: continuous hot water with shower mixer 8Oct 02, 2019 11:12 am BBJ aussieta now the specs make sense thank you! Looks like 25 degree rise at 26L and 40 degree rise is 16.5L- which is still two showers with 7.5L shower heads I'm guessing. The other things to consider is what size water pipes are going to feed in the 'cold' (to the HWS) and also feed out the 'hot' (from the HWS)? If they are around 15mm internal diameter, then because these supposedly have about a 16 l/m capacity throughput, there would be little benefit installing anything larger than a '16' rated instant HWS. With your 26-27 rated units they required 20mm (3/4 inch) inlet and outlets pretty much for their entire lengths. It's logical in that what is the point of being able to heat say 26 l/m with a 25deg temp increase, but the water can only be fed in or out at say 16 l/m? So many people mistakingly install these larger systems, whereas they would be better of going with a smaller unit. It's a bit like buying a ferrari to just put around the suburban streets to go to the local shops occasionally! --------------------------------------------------------------------- Check our Homeone build blog here Re: continuous hot water with shower mixer 9Oct 02, 2019 11:13 am This plumber actually has some videos on the topic, so this might explain it better than a non-plumber like myself: https://www.youtube.com/watch?v=XpMjqAV-rIQ --------------------------------------------------------------------- Check our Homeone build blog here Re: continuous hot water with shower mixer 11Oct 02, 2019 2:36 pm darb74 This plumber actually has some videos on the topic, so this might explain it better than a non-plumber like myself: https://www.youtube.com/watch?v=XpMjqAV-rIQ Good link. Copper pipe sizes are nominal (internal diameters are smaller) and maximum flow velocities through pipes are regulated. A school kid who knows how to calculate a cylinder's internal volume and flow rate in metres per second would know that the plumbing shown in the video depicts incompetence. Sadly, the installation is still compliant. 3in1 Supadiverta. Rainwater Harvesting Best Practice using syphonic drainage. Cleaner Neater Smarter Cheaper Supa Gutter Pumper. A low cost syphonic eaves gutter overflow solution. the sun master is the solar heating to "warm" the water in the tank the S26 is your hot water system which will heat the water (25 degrees?) so with both turned on you… 2 14181 I want to build a decking to the drawn shape outlined in black. The problem is how close can I build to the gas hot water unit? Will I be able to build around it and be… 0 20338 DIY, Home Maintenance & Repair Hi, I've got a brand new (2nd hand) Bosch Hydropower 16H tankless hot water heater. Since it was installed I have noticed it leaks a lot. I took the cover off and it looks… 0 24282 |