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Hey there....I can read a curve as I used to do quite a few calculations building a few koi ponds with waterfalls, etc. So, I do understand the relationship between pressure, head height to overcome, etc. I don't understand it perfectly but understand it enough to know that somewhere in that...

Yes, any speed registers 1gpm. It's the 15-55 (actual pic of it below). I bought it for the Auto adapt feature which I'm now realizing doesn't work for this setup. No matter which of the 3 speeds it's on...gpm doesn't change. I do hear the pump making the change in speed. The manufacturer...

I am learning and this is helpful. I'm getting different answers though. I see the s trap because I know there is a minimum trap to "fall" distance to not be considered an "s" I just don't know what it is. However, I asked inspector about combos and long sweep and he said he preferred combos...

The diagram that I posted in the original post was actually given to me by the manufacturer who is working with me and says I shouldn't need a small tank heater to jumpstart and my setup is fine and the 1" PEX line is smart to overcome pressure loss and should work beautifully!

In order to vent if needed you just run the pump on the speed of III and it purges.

Thank you Diehard & breplum! I did install a 400 amp service to the house and put on a PV array and yes, that's why I'm using electric...dual electric at that just for the volume (4 kids). So the Grundfos Alpha2 does have an autoadapt feature but also a "set" feature so I've put the unit to...

I did a little research and found that this pump is self-venting and there is zero noise in the system. I just can't seem to get the flow to kick it on. The Tempra model comes on at a minimum flow of .5 gpm which technically should be activated with the Grundfos showing movement at 1 GPM.

breplum...thanks for the response. I am the plumber...unfortunately. But...I just plumbed a six bathroom house so I'm on a roll! Anyway, I had read something about air lock but don't know enough about it. I read that you could put a relief valve or something of that nature into the line...

I just joined to post myself and read your post. I'm not a plumber but if you're comfortable like I am with the water lines, pex, fixtures, etc. then the sewer line is easy! No pressure in the line and hard to mess up...just has to flow down. I just re-plumbed my whole house from scratch and...

Hello all! I'm excited to have found this forum! I have attached what my setup looks like for a visual. I don't have a timer or an aquastat but I'm trying to circulate my hot water with my two tankless heaters. The loop in the diagram is about 160' of 1" Pex-a around the house. I have a...