Browse Forums Building A New House 1 Dec 30, 2023 3:16 pm My walls are in and roof is done I want to install Bidet seat, and its a requirement to install a Back-flow Prevention Valve Can this be installed now, how difficult is it? Any alternative solution? Re: Back-flow Prevention Valve ? 2Dec 30, 2023 6:51 pm Your licensed plumber will know the regulations and what to do. 3in1 Supadiverta. Rainwater Harvesting Best Practice using syphonic drainage. Cleaner Neater Smarter Cheaper Supa Gutter Pumper. A low cost syphonic eaves gutter overflow solution. Re: Back-flow Prevention Valve ? 4Dec 31, 2023 6:33 am ownerinproblem You are apparently intending to do ILLEGAL DIY plumbing work! Here are the facts: What you are (apparently) intending to (wrongly and illegally) do is regulated plumbing work that must be done by a registered plumber who is licensed to perform that class of work. The three classes of backflow risk are low, medium or high as per AS/NZS 3500.1 Bidets are rated as high risk and require a RPZ valve. These differ from the normal dual check valves (DC) in that they discharge any backflow to atmosphere via a relief valve if both check valves fail. DCs don't do this. There is no way of knowing whether a DC has failed. BUNNINGS: It is bad enough that Bunnings sell products that are not compliant once fitted (I am not referring to the Kinetic "Backflow Preventer" here when used as per the regulations) but it is even worse when a Bunnings employee recommends a product (Kinetic "Backflow Preventer") that doesn't comply with a critical plumbing regulation when fitted for Joe Public's stated intended use. Bunnings even allows illegal online advice (see link below) from their team and unknown Joe Publics that remain uncorrected or undeleted. One such example about a bidet connection is below. A plumbing company later posted the facts with regulatory references (I suggest you read their post), only to be then asked a moronic question from the "Bunning's resident DIY expert" about using the Kinetic Back Flow Preventer.....which the plumbing company never dignified with an answer. https://www.workshop.bunnings.com.au/t5 ... td-p/66417 As per what I originally posted, "Your licensed plumber will know the regulations and what to do." 3in1 Supadiverta. Rainwater Harvesting Best Practice using syphonic drainage. Cleaner Neater Smarter Cheaper Supa Gutter Pumper. A low cost syphonic eaves gutter overflow solution. Re: Back-flow Prevention Valve ? 5Dec 31, 2023 6:16 pm SaveH2O ownerinproblem You are apparently intending to do ILLEGAL DIY plumbing work! Here are the facts: What you are (apparently) intending to (wrongly and illegally) do is regulated plumbing work that must be done by a registered plumber who is licensed to perform that class of work. The three classes of backflow risk are low, medium or high as per AS/NZS 3500.1 Bidets are rated as high risk and require a RPZ valve. These differ from the normal dual check valves (DC) in that they discharge any backflow to atmosphere via a relief valve if both check valves fail. DCs don't do this. There is no way of knowing whether a DC has failed. BUNNINGS: It is bad enough that Bunnings sell products that are not compliant once fitted (I am not referring to the Kinetic "Backflow Preventer" here when used as per the regulations) but it is even worse when a Bunnings employee recommends a product (Kinetic "Backflow Preventer") that doesn't comply with a critical plumbing regulation when fitted for Joe Public's stated intended use. Bunnings even allows illegal online advice (see link below) from their team and unknown Joe Publics that remain uncorrected or undeleted. One such example about a bidet connection is below. A plumbing company later posted the facts with regulatory references (I suggest you read their post), only to be then asked a moronic question from the "Bunning's resident DIY expert" about using the Kinetic Back Flow Preventer.....which the plumbing company never dignified with an answer. https://www.workshop.bunnings.com.au/t5 ... td-p/66417 As per what I originally posted, "Your licensed plumber will know the regulations and what to do." That was knowledgeable information The plumber said , it’s not easy to do the back overflow valve now that the walls are done! Re: Back-flow Prevention Valve ? 6Dec 31, 2023 6:42 pm A RPZ valve is larger than a standard DC valve due to it having the backflow discharge facility. A RPZ valve is also mandated to have annual inspections. Maybe you could be inventive by having a recessed wall storage space (or two for aesthetics) that could be pulled out when required to check the RPZ. You would only need an enclosed 'box' that slid into an open frame. If you have a bidet seat that has a minimum 25mm air gap, you do not need a RPZ valve. The Fair Trading (NSW) doc below is worth reading. https://www.fairtrading.nsw.gov.au/trad ... ow-control There is a lot of ongoing concern in the industry about illegal bidet installations. I am in Vic and I will link a VBA media release below but ones from other States are easy to find. https://www.vba.vic.gov.au/__data/asset ... evices.pdf 3in1 Supadiverta. Rainwater Harvesting Best Practice using syphonic drainage. Cleaner Neater Smarter Cheaper Supa Gutter Pumper. A low cost syphonic eaves gutter overflow solution. Re: Back-flow Prevention Valve ? 7Dec 31, 2023 10:31 pm SaveH2O A RPZ valve is larger than a standard DC valve due to it having the backflow discharge facility. A RPZ valve is also mandated to have annual inspections. Maybe you could be inventive by having a recessed wall storage space (or two for aesthetics) that could be pulled out when required to check the RPZ. You would only need an enclosed 'box' that slid into an open frame. If you have a bidet seat that has a minimum 25mm air gap, you do not need a RPZ valve. The Fair Trading (NSW) doc below is worth reading. https://www.fairtrading.nsw.gov.au/trad ... ow-control There is a lot of ongoing concern in the industry about illegal bidet installations. I am in Vic and I will link a VBA media release below but ones from other States are easy to find. https://www.vba.vic.gov.au/__data/asset ... evices.pdf Sorry to bother you, could you please suggest any non electric bidet which meets this requirement of 25mm gap? I looked at this one https://www.bunnings.com.au/evekare-wat ... t_p0337590 Re: Back-flow Prevention Valve ? 8Jan 01, 2024 5:25 am I can't recommend anything, sorry, because I have nothing to do with bidets apart from advising people I talk to that their bidet isn't compliant when I see they have rainwater connected. Most of the time, those installations are also DIY and don't have a RPZ or even a DC at times. There are specialised bathroom showrooms that should be able to help you. Using Google and appropriate keywords should also fast track your search results. I clicked on the Bunnings link and read the first review which stated in part: To be watermark compliant, you need a backstop valve, a la this Kinetic one. It's not included, but you should have it even if you aren't getting a plumber to do the installation. https://www.bunnings.com.au/kinetic-chr ... r_p4920512 - It's a worry! 3in1 Supadiverta. Rainwater Harvesting Best Practice using syphonic drainage. Cleaner Neater Smarter Cheaper Supa Gutter Pumper. A low cost syphonic eaves gutter overflow solution. Re: Back-flow Prevention Valve ? 9Jan 01, 2024 11:52 am SaveH2O I can't recommend anything, sorry, because I have nothing to do with bidets apart from advising people I talk to that their bidet isn't compliant when I see they have rainwater connected. Most of the time, those installations are also DIY and don't have a RPZ or even a DC at times. There are specialised bathroom showrooms that should be able to help you. Using Google and appropriate keywords should also fast track your search results. I clicked on the Bunnings link and read the first review which stated in part: To be watermark compliant, you need a backstop valve, a la this Kinetic one. It's not included, but you should have it even if you aren't getting a plumber to do the installation. https://www.bunnings.com.au/kinetic-chr ... r_p4920512 - It's a worry! You have been of great help mate! I will find out what to look out for Re: Back-flow Prevention Valve ? 10Jan 01, 2024 3:14 pm Good luck with it. I don't know what the cost of a nice bidet seat with a 25mm air gap will be but you are obviously deducting the cost of a RPZ valve and its installation from the seat's cost. The additional cost savings of the annual RPZ test will also be substantial. 3in1 Supadiverta. Rainwater Harvesting Best Practice using syphonic drainage. Cleaner Neater Smarter Cheaper Supa Gutter Pumper. A low cost syphonic eaves gutter overflow solution. No. You only have to restrict the opening of any window when the opening starts below 1700 finished floor height or there is a transom or other climbable surface (toilet,… 1 1136 First time building 2 storey home, is under construction (in Framing stage) in NSW. I have 3 toilets and need bidet spray in… 0 17000 You may still have a case, but your next step is to speak to a lawyer. 3 1833 |