Browse Forums General Discussion 1 Jul 01, 2010 7:05 pm Has anyone got two instantaneous gas water heaters linked together? I know this can be done with a few types, e.g.Rheem & Dux so that the two 26 ltr/min units combine to give up to 52 ltr/min if demand requires the second unit to kick in to keep flow constant. Possibly looking at this option as usage from three bathrooms with teenagers could mean higher demand at times than a single unit can manage. Any information or other suggestions appreciated. Re: Linking two instantaneous water heaters 2Jul 01, 2010 9:50 pm Don't know abt linking them together. Never heard of it. But my house is a big 2 storey homes which need 2 x Rinnai Inst. 26+. What my plumber did is that left side of the house will be run by 1 unit and the other side will be run by other unit. Re: Linking two instantaneous water heaters 3Jul 13, 2010 7:12 pm You would have to install one at one end of the house and one at the other. plus when would you ever need 52ltrs a minute. Rheem and Rinnai both make 32lt models and that would be ample considering shower heads now put out 9ltrs of mixed water at a time, so even if you had 3 showers on at the same time you would only need a maximum of 27ltrs and that water is mixed with cold. Re: Linking two instantaneous water heaters 4Jul 13, 2010 7:16 pm the only reason i could think off that requires two unit is that you house spans a great distance and the bathroom are two far away from each other resulting in long delays. The ironly is that large double storey houses are actually better and can potentially have shorter runs, as generally everything is closer to each other. But if i were to install two I would put them on seperate cicuits so to speak, with a aim to reduce the maximum run. Re: Linking two instantaneous water heaters 5Jul 17, 2010 10:14 am Thanks for your replies. I was intereted to see if anyone had got a linked system to get some feedback on performance and not surprised it isn't common. I'm sure it would be overkill to have the 2 units but just keep hearing the negatives of the instantaneous type of heater is the drop in flow when other taps are turned on, which would also be worse in winter with the lower temperature infeed water. No doubt when it comes to hot water systems our builder will have a plumber that will be able to give us a good assessment based on our plans and projected useage from bathrooms and appliances. Cheers. Re: Linking two instantaneous water heaters 6Jul 26, 2010 2:37 pm you could link 65 together and you will still only get 26lt of flow per minute, probably less due to friction loss. Best bet for larger houses is a circulating heat pump, mutiple HW units to separate zones or a larger capicity unit (32Lt). Re: Linking two instantaneous water heaters 7Jul 26, 2010 9:15 pm The manufacturer obviously thinks that you can get 52 ltrs/min by linking or "cascading" them. Perhaps you could let them know it's not possible. http://www.dux.com.au/products.php?name=6 Re: Linking two instantaneous water heaters 9Jul 27, 2010 6:45 pm Richard - Just read my last post -logged on, typed a quick reply and logged off. Didn't mean to sound stroppy hope I didn't offend. Thanks for your suggestions - all advise greatfully received. Hi, We're building a double-storey in Perth and I'm undecided with the kitchen sink situation. I'm set on having the main sink with dishwasher in the scullery - and… 0 21222 2 3208 The price you're seeing for a high-spec 2-storey home in Perth sounds steep, but unfortunately, it's kind of the norm these… 8 8975 |