jrogers99
Member
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 Grundfos Alpha2 right on the outlet of the second water heater pushing water the 160' around. It's a 2 story house and I have to pump it up about 21' from lowest to highest point which I'm not sure matters when it's a closed system? Obviously when water is demanded it's an open system but the house pressure takes over.
Anyway....I set the pump on any speed and it registers 1 gpm but it doesn't kick on either Tempra water heater. They're plumbed just like in the pic attached. Is it because the Alpha2 has a head height of only 16' or so? Do I need a pump that moves faster? I'm getting ready to move back into the house after a full remodel and I want this system to start moving hot water around the "loop". I think I should probably add a timer too. Thank you for any ideas on how to get this going!!! I'm sure I'm just missing something!
Anyway....I set the pump on any speed and it registers 1 gpm but it doesn't kick on either Tempra water heater. They're plumbed just like in the pic attached. Is it because the Alpha2 has a head height of only 16' or so? Do I need a pump that moves faster? I'm getting ready to move back into the house after a full remodel and I want this system to start moving hot water around the "loop". I think I should probably add a timer too. Thank you for any ideas on how to get this going!!! I'm sure I'm just missing something!
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