jnlombard Posted April 11, 2007 Report Share Posted April 11, 2007 Hi, Found a Hot Water tank without a Pressure Relief Valve. (PRV) during an inspection. Do some Hot water tank designs not need a PRV?? Quote Link to comment Share on other sites More sharing options...
randynavarro Posted April 11, 2007 Report Share Posted April 11, 2007 Well, I'll CMA (Cover My A_ _) and say I haven't read all the mfg's specs in the world so I guess there might be some possiblity but. . . . . . common sense and knowing what happens to water when it overheats says absolutely. Otherwise, you can have a rocket (or bomb depending on your perspective) on your hands. Quote Link to comment Share on other sites More sharing options...
ozofprev Posted April 11, 2007 Report Share Posted April 11, 2007 Doesn't seem possible. Heat -> expansion -> big bang. TPR is required and is a serious concern if missing. Hi,Found a Hot Water tank without a Pressure Relief Valve. (PRV) during an inspection. Do some Hot water tank designs not need a PRV?? Quote Link to comment Share on other sites More sharing options...
Neal Lewis Posted April 11, 2007 Report Share Posted April 11, 2007 Some real old water heaters did not have an opening for a relief valve. The valve was installed on the hot water piping near the tank. Same goes for old boilers. Quote Link to comment Share on other sites More sharing options...
Chad Fabry Posted April 11, 2007 Report Share Posted April 11, 2007 Indirect units can be protected by the boiler pressure relief. Quote Link to comment Share on other sites More sharing options...
ozofprev Posted April 11, 2007 Report Share Posted April 11, 2007 So, Jan, What type of water heater is it? We want to know. Quote Link to comment Share on other sites More sharing options...
hausdok Posted April 11, 2007 Report Share Posted April 11, 2007 Hi, Was it in a basement? If so, did you look for a Watts 210 valve someplace? OT - OF!!! M. Quote Link to comment Share on other sites More sharing options...
Neal Lewis Posted April 11, 2007 Report Share Posted April 11, 2007 Chad, Do you mean a tankless coil type or an indirect like a Boilermate/Amtrol type. The indirects I've seen all have a relief valve. Quote Link to comment Share on other sites More sharing options...
Les Posted April 11, 2007 Report Share Posted April 11, 2007 Pretty interesting question! When I think about it, I have seen hundreds of water heaters with just a pressure relief; blow plugs, dole valves, etc. All were very old. I have had lively discussions regarding the terminology with these devices: T&P, TPR, pre-set Pressure, adjustable pressure, adjustable temp, loops, etc. If memory serves me correctly, Arkansas was the first state to require a device to protect air compressors and water heaters re: temp and pressure. Water heaters are the topic of lots of good inspector lore! I am not aware of any water heater, modern, that does not require a t&p device. Even those InstaHot faucets. Quote Link to comment Share on other sites More sharing options...
Javier Posted November 11, 2009 Report Share Posted November 11, 2009 with the Watts 210 Valve i can only run a PRV at a exterior Hose Bibb that is 3/4 galvanized pipe. i cant go any other way becouse the location of the water heater does not allow me to run pipe left or right. will it pass inspection by hooking up the PRV to the Hose Bibb? [:-monkeyd Quote Link to comment Share on other sites More sharing options...
hausdok Posted November 11, 2009 Report Share Posted November 11, 2009 Hi, I'm not sure I understand the question; isn't the Watt's 210 designed to shut off the gas to the burners in order to prevent the temperature from going any higher? I thought a sensor was installed in the tank and wires run to a solenoid shutoff installed in the gas line; did I get this wrong? OT - OF!!! M. Quote Link to comment Share on other sites More sharing options...
Jim Baird Posted November 12, 2009 Report Share Posted November 12, 2009 Do some Hot water tank designs not need a PRV?? no Quote Link to comment Share on other sites More sharing options...
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