Browse Forums Heating, Cooling & Insulation Re: Recirculating Hot Water Service 7Nov 23, 2016 9:17 am Building Services Engineer Renovating our 1960's modernist home in Brisbane https://forum.homeone.com.au/viewtopic.php?f=53&t=82091 Re: Recirculating Hot Water Service 9Nov 24, 2016 12:50 pm Building Services Engineer Renovating our 1960's modernist home in Brisbane https://forum.homeone.com.au/viewtopic.php?f=53&t=82091 Re: Recirculating Hot Water Service 12Dec 04, 2016 4:47 pm Bels I don't think the heat pump HWS is going to be too flash when used with a circulation pump. If you disregard the recycle timer I'm using and use purely a time clock, when it's running in the morning and at night only, the circulated water will still call the heat pump on and run the compressor if the return water is below its setpoint. I'll try to detail an example below if that helps to explain what I mean. Time clock allows operation between 5am - 8am so the circulation pump is running constantly during that time. Heat pump starts at 5am and switches off at 5.20am when the hot water is 65 degrees. With heat losses, the return water temperature drops to 50 degrees at 5.45am and the heat pump starts again Heat pump switches off at 5.50am when the hot water is 65 degrees At 6.15am the return water temperature drops to 50 degrees and heat pump switches on At 6.20am heat pump switches off again At 6.50am heat pump switches on At 7.05am heat pump switches off And so will continue until 8am when the time clock stops the circulation pump from operating. That's the sort of starting and stopping I was referring to in my original reply. Maybe contact the manufacturer of the heat pump HWS you intend of using and check if their system is compatible with a reticulated hot water system. hth Thanks, I should find out more about the heat pump. Re: Recirculating Hot Water Service 13Dec 06, 2016 10:48 am The builder suggested us to replace solar hot water with heat pump system, it also fit with recirculating pumps. However, I read some articles that suggested the unit is only work well in warm, humi climate; does it mean the performance in Melbourne winter will be halved? Any thought? I sent your set up system to the builder, but seems they reckon that we are different. Re: Recirculating Hot Water Service 14Dec 06, 2016 10:54 pm Yeah usually in low ambient temperatures (dead of winter in Melbourne) heat pumps will struggle to draw heat out of the air and ice forms on the outdoor coil after prolonged operation. I've had a quick look and Sanden, Rinnai, Rheem, Chromagen and Dux heat pumps all don't recommend installation in Melbourne/Victoria in general as you'll likely be using the booster element a fair bit which defeats the purpose of getting a heat pump. Solahart works down to 3-5 degrees and utilizes the booster element after that so also not that flash. The Stiebel Eltron heat pump is equipped with active defrost so would be my recommendation though I'd still check with them on compatibility with circulation pumps. My experience with finding builders was that most did not want to do anything that was out of the norm for them. Re: Recirculating Hot Water Service 15Dec 07, 2016 6:08 am Yeah builders often don't really know what they're talking about with electrical/mechanical stuff and don't like departing from their usual setup. Building Services Engineer Renovating our 1960's modernist home in Brisbane https://forum.homeone.com.au/viewtopic.php?f=53&t=82091 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 14103 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 20256 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 24181 |