Hot Water Systems - Lpg V's Offpeak Electric

[Bebbo]

Tempering valve.... I fail to see the point of heating the water then cooling it again apart from protecting children and the aged/infirm. We've got a tempering valve in the guest room HWS which only gets turned on when we've got guests. We asked the plumber not to fit one in the main HWS when we built the house. I got the sparkie to turn the thermostat down to 50C and fit a timer in the circuit. The timer comes on for a couple of hours in the afternoon and can be overridden when necessary.
Geoff.

I'm fairly certain its mandatory now to be fitted on a hws. Atleast in qld I'm certain it is.

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[Boringgeoff]

Bebbo I think it is mandatory also in WA. We instructed our plumber not to fit one. Our previous house built in 1978 didn't have one, in fact in the 70's in Karratha you could barely get under the cold water in the middle of summer.
Geoff.

[Toymaker Len]

Geoff you don't need a tempering valve if you have a system with a thermostat, ie gas or electric but the solar, particularly vacuum tubes, gets really really hot. The sort of hot where granny is bathing the two year old, gets distracted, the two year old knocks the hot full on, slips over and gets blasted with 120 degreeC water, spends a year in hospital and lives with the injuries for life. The tempering valve doesn't bring the hot water temperature back down, it simply adds cold water at a controlled rate so much less super hot water is used.

[Bebbo]

I built a block of unitd and spome directly with tge hydraulic engineer and the building certifier and both said they all need tempering valves.

I would only assume a thermostat would suffice. The hot water must be within a certain range of temperature so however you limit it aslong as you limit it it was my understanding that its fine then.

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[kiwigeo]

If you instruct your plumber to leave out the tempering valve then he needs to make you sign a written instruction to do so. If an accident happens and the lack of the tempering valve is found to be a factor then your poor old plumber will be the one they go after.

[AlexS]

If you instruct your plumber to leave out the tempering valve then he needs to make you sign a written instruction to do so. If an accident happens and the lack of the tempering valve is found to be a factor then your poor old plumber will be the one they go after.

Even that will probably not protect him.

[kiwigeo]

Even that will probably not protect him.

Most likely not....

[Bebbo]

If you instruct your plumber to leave out the tempering valve then he needs to make you sign a written instruction to do so. If an accident happens and the lack of the tempering valve is found to be a factor then your poor old plumber will be the one they go after.

A letter won't decriminalize professional negligence causing actual bodily harm.

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[Boringgeoff]

No one is going to get scalded in my house, the thermostat is set at 50C, though after Elver's warning we may have to raise that. The guest room HWS has a tempering valve so it's safe. The reason for two HWS is to avoid the long runs of pipe where the showeree has to stand there wasting water waiting for the hot to come through. The water heater in the guest room, equipped with a tempering valve is located on the other side of the wall of the guest bathroom, in the garage, and is only turned on when there are guests in residence. The main water heater, without the tempering valve, is in the laundry with the kitchen on the other side of the wall and the bathroom on the other side of the laundry, so no long runs of pipe there either.
Of course there is always the chance that the Feds are monitoring this forum and have taken note that I haven't got a tempering valve and there is a squad from the Noncompliant Plumbing Division on it's way as we speak. Keep your head down Hans................oh no.... I've let on the ID of our plumber...

[Toymaker Len]

You are safe Boringgeof, I am absolutely certain that you only need a tempering valve when the system has the potential to become lethally hot and that is not the case when you have thermostats governing the heating element. The thing with the solar, particularly vacuum tubes, is that they keep pumping up the heat as long as the sun is shining (only a layer of snow stops them) so they can get very hot indeed. (OK Hans, you can come back up now)

[Bebbo]

No one is going to get scalded in my house, the thermostat is set at 50C, though after Elver's warning we may have to raise that. The guest room HWS has a tempering valve so it's safe. The reason for two HWS is to avoid the long runs of pipe where the showeree has to stand there wasting water waiting for the hot to come through. The water heater in the guest room, equipped with a tempering valve is located on the other side of the wall of the guest bathroom, in the garage, and is only turned on when there are guests in residence. The main water heater, without the tempering valve, is in the laundry with the kitchen on the other side of the wall and the bathroom on the other side of the laundry, so no long runs of pipe there either.
Of course there is always the chance that the Feds are monitoring this forum and have taken note that I haven't got a tempering valve and there is a squad from the Noncompliant Plumbing Division on it's way as we speak. Keep your head down Hans................oh no.... I've let on the ID of our plumber...

50c is the temp where you don't kill legonaires and other bacteria. Hence why its set higher to kill off any other contaminants too.

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[Bebbo]

What water conditions are best for growth of the organism?

A.Warm, stagnant water provides ideal conditions for growth. At temperatures between 20°C-50°C(68°-122°F)the organism can multiply. Temperatures of 32°C-40°C (90°-105°F) are ideal for growth. Rust (iron), scale, and the presence of othermicroorganismscan also promote the growth of LDB.

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