Browse Forums General Discussion 1 Jun 02, 2015 5:43 pm Our builder has recommended we go two hot water units, we aren't too keen to run copper pipe to another unit on other end of the house . Thinking we can just go a Solar HW unit with an instantaneous booster on it to boost, has anyone gone a unit similar and how have you found it goes getting Hot water around a large house? Re: Hot Water Units... 2Jun 02, 2015 5:51 pm Yes I have and you wait ages for the water to run hot at the furthest tap. Some of the issues i have encountered are on my blog here http://www.anewhouse.com.au/2012/02/plu ... hot-water/ The Harder You Try - the Luckier You Get ! Web site http://www.anewhouse.com.au Informative, Amusing, and Opinionated Blog - Over 600 posts on all aspects of building a new house. Re: Hot Water Units... 3Jun 02, 2015 6:01 pm Thanks Bashworth, our main unit would be located right next to bathrooms, but our laundry and kitchen are at the opposite end of the house... so guess its just whether we an live with waiting for hot water in the kitchen / laundry? Re: Hot Water Units... 4Jun 02, 2015 6:32 pm That sounds like a pain. I've heard people say it's best to have the HWS next to the kitchen as that's where you use lots of hot water in small goes.. but then personally I would hate to run out of hot water while in the shower. Good luck deciding! Re: Hot Water Units... 5Jun 05, 2015 9:22 pm We're planning on a solar system with electric boost, but thinking of having a mini system under the kitchen sink just for the kitchens (our outdoor kitchen sink will be outside the kitchen window). Both bathrooms and the laundry are close together but on the other side of the house. I hate running the kitchen tap for 45 seconds waiting for hot water when I only need to use the hot water for <5 seconds!! Re: Hot Water Units... 6Jun 05, 2015 9:58 pm In the past I have installed hot water pipelines that are pumped / circulated , good idea on large homes but costly for installation and of course extra lagging / insulation on the pipe work is required to help with heat loss , it was quite some time ago and I have not really heard of anyone doing it these days but with the current level of technology it really should be something worth considering , should be quite easy to set up timers to only circulate the hot water in peak demand periods , of course it would be a matter of working out which way is more cost effective however an extra hws may well be a cheaper alternative ( small units are not really any cheaper to buy or install than standard units , low demand keeps the prices high on the smaller units ) If you don't have lots of space to put any extra hardware though it could be worth looking in to . Hope you find a solution that suits you . Re: Hot Water Units... 7Jun 06, 2015 2:59 am Any difference between the large gas powered hot water storage (e.g. 140 litre tanks) vs the small tank instantaneous hot water tanks? The builders say the instantaneous are flawless int he sense that there really is instant hot water, but having moved from an old gas hot water and solar system, to this new house I'm currently in, we find the hot water doesn't always come on in the bathroom or kitchen sinks. Sometimes it keeps flowing hot , other times I just find no hot water at all (even if no one else is using). Luckily at full blast the shower always has hot water (after we got a plumber in) - so I'd be curious whether instantaneous hot water systems are a gimmick or actually work, or whether the one at our house is just faulty... Re: Hot Water Units... 8Jun 06, 2015 6:31 am On the instantaneous hws units there is a bit of an issue with them actually recognising water flow at low volumes , this is usually due to water saving tapware either not allowing enough flow or allowing the higher cold water pressure/flow to create a bit of back pressure in the hot water pipelines . You may want to get the water saving disks taken out of the taps if this is an issue . Re: Hot Water Units... 9Jun 06, 2015 9:51 am I don't know about the rest of you, but when my draughtsman drew up the plan, he put the hot water tank down next to the ensuite, but I got him to redraw it to put next to the kitchen. So what I am saying is why can't you get your hot water system put closer to the kitchen, i.e. where you need small amounts of hot water fairly quickly ? Instant hot water systems need to heat the water to over 70 degrees, then run via tempering valve to bring it back down to less than 50 degrees, although that said you are allowed to run untempered water to your kitchen and laundry. Storage tanks only have to keep the water at 60 degrees. Owner Building at Jimboomba Woods in Logan City Qld. Blog : http://bandlnewhomebuild.blogspot.com H1 thread : viewtopic.php?f=38&t=68283 . Re: Hot Water Units... 10Jun 18, 2015 11:20 pm We ended up scrapping the solar and getting two instantaneous. We have instantaneous atm and yes - we have had to replace water saving shower heads for normal ones etc to get the hot water to run properly - not sure if running from a pump vs mains water is part of that issue of water pressure running through though? The time to heat is purely a function of the distance between the hws and the faucet. 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