What is this type of faucet called?

[villager]

Hi, First post.

Writing from New Zealand where we have a kitchen faucet that used to be called a "pusher" faucet. I say "used to be called" because I cannot find that sort of faucet when doing google searches.

When the hot water is turned on, the valve in the faucet releases pressurized cold water that flows into the under-bench hot water tank. The tank hot water outlet has no valve on it (continually open to the hot water outlet side of the faucet), so the cold-water inlet pressure causes hot water to come out the outlet from the tank and then flow into the hot water side of the mixer faucet.

From a user perspective, it works like a normal mixer faucet, but it has the benefit of allowing a small, underbench tank that does not require a pressure relief valve because the hot water side is always open. Instant hot water without the complex plumbing of a pressurized hot water line (there is very little extra room under the sink and only a cold water line run under the concrete floor).

The faucet was imported from an Eastern European country, and I bought it about ten years ago. It is due for replacement but searching for "pusher" faucet and all sorts of descriptions yields nothing.

Does anyone know what this type of faucet is called; how would I google search for it?
Does anyone know where replacements can be purchased?

Thanks

 

[villager]

I'm new to this forum. Is it an active forum, or do postings remain unanswered? Not a criticism, just trying to get a sense of it.

 

[Mr_David]

Sorry never heard of such a thing.

I was in your country once back around 1978.
Had a great time and met some really nice people.

This is the only photo I have from there.

 

[havasu]

I'm new to this forum. Is it an active forum, or do postings remain unanswered? Not a criticism, just trying to get a sense of it.

Yes, the forum is very active, Problem is the spammers like to hit us with their porno crap, so for the first few posts, you have to be manually allowed entry into here. Once you are established, us volunteers do not need to do anything with your posts.

BTW, welcome to the forum!

 

[Debo22]

Sorry never heard of such a thing.

I was in your country once back around 1978.
Had a great time and met some really nice people.

This is the only photo I have from there.

Groovy 70's photo!

 

[villager]

Looks like I found the answer with more google searching. It is called an open vent mixer faucet:

Open vent faucets allow the "instant hot" tank to run without a temperature and pressure relief valve as is found in your domestic hot water heater; the tank normally runs at atmospheric pressure (is vented through the faucet spout itself) and is only pressurized to the extent that when you open the hot water dispensing valve you are actually allowing cold water to enter the tank thus forcing hot water out through the spout, which is always open through to the tank. When you release (close) the hot water dispensing valve the cold water supply to the tank is once again shut off, ending the flow of hot water and leaving the tank vented through the faucet.

This method of avoids/solves the problem of providing a safe method and place to vent a tank overpressurized as a result of a stuck thermostat

While often sold as hot water only, ours is a mixer with cold and hot water and an underbench low-pressure tank

 

[SHEPLMBR]

I am here in the states and was not familiar with what you described.

 

[Mr_David]

I wonder if those are even used here in the states. We often find 2-1/2 gallon units under sinks with no T&P drains and to meet code compliance, cannot legally replace them because there is no place to run the drain to.

 

[kitchen_faucetpro]

Thanks for your share. I want to inform you that, there have 14 Types of Kitchen Faucets available both in online and local markets.

 

[Daysikia92]

I have never heard this before.