Monoblock freeze protection valve

Kaos

 I can’t find a North American equivalent of a Caleffi IStop.

I could try and order from overseas but would still have to deal with G thread. 

There has to be something locally available that will work.

This would be for an air to water monoblock install in Zone 5.

https://www.caleffi.com/en-int/antifreeze-valve-108-caleffi-108601

Jamie Hall

Have you contacted Caleffi directly?

hot_rod

Are you looking for one? What size?

We have some in Milwaukee, we add tailpieces for various connections

Sweat, press, pex, threaded

Kaos

Thanks hot_rod,

Definitely interested in a set. Preferred would be 1" FNPT on both side but flexible. Looking for two pieces.

Who should I contact?

jas8425

Oh wow, a thread that I'm not 2 years too late for! I have also been trying to find a couple of these, ideally either 1" sweat or threaded. The one w/ air temp sensing would be even more ideal as I do plan on running chilled water for AC in the summer, but I'm 95% sure it's not required as the minimum chilled water temp my unit outputs is 7℃, and these valves open at 4℃.

The other options I was able to find are: https://www.thermomegatech.com/product/icfp/ and https://www.zurn.com/products/water-control/backflow-accessories/zwfr But neither of those have the (what I assume to be) vacuum breaker component on top, and AFAICT they're more designed for backflow-preventer antifreeze or something else related but not exactly the same as an air-to-water heatpump installation.

Who should I reach out to @hot_rod?

hot_rod

Here is the info for ordering the valves. Where are you located? Most wholesalers can order these, they are in the 2024 catalog page 126.

Screenshot 2024-09-20 at 3.16.16 PM.png

Screenshot 2024-09-20 at 3.12.38 PM.png

DCContrarian

I know you have to keep on good terms with your wholesalers, but it's a real chore to go through that distribution channel when all you need is a few of an obscure part. You sure you can't sell a few on Ebay under an alias?

hot_rod

https://forum.heatinghelp.com/discussion/comment/1811146#Comment_1811146

Yeah, the odd or low turn parts are culled out of wholesalers these days. They also tend to have a minimum order to get freight incentives, and not all will order one or two parts..

SupplyHouse.com seems to carry some of the unusual parts.

The G thread is on all those valves, so if you find on from a UK, e-bay, or other site, you can get just the tailpieces you need.

That is true of most any Euro part. The US is about the only place that uses NPT, so the adaption is made with nuts and tailpieces. Which also gives you service unions on many of the components.

Kaos

https://forum.heatinghelp.com/discussion/comment/1811144#Comment_1811144

Hot_rod

Thanks for the link. After some chasing managed to get pricing from local distributor on the part, in the end I ended up ordering from overseas as a pair of them was less then a single unit here (seems to be the Canadian way of pricing).

For others that are looking. The other options readily available are:

Zurn:

https://www.zurn.com/media-library/web_documents/pdfs/specsheets/bf-zwfr-pdf

Sanco2:

https://eco2waterheater.com/wp-content/uploads/2024/05/ECO-FPVKT-SMTW-Drain-Down-Valve-Kit-Submittal-04-2024-Rev2.pdf

hot_rod

https://forum.heatinghelp.com/discussion/comment/1811723#Comment_1811723

I don't see a vacuum breaker on that version. Looksm like it intended to protect a vacuum breaker?