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I have a house in an area that uses a water tower for pressure and pressure at lower floor is 20-22 - psi. I wanted to bring the pressure up to a more normal 50-60 so my tub doesn't take 25 minutes to fill. I started with a scala2 and it worked well enough with high demand but with low demand (single sink fixture) it acted more like a pump on a 40/60 pressure switch and would cycle a lot. It was like it the slowest the pump could run was too fast. The core issue of the cycling was that when it hit 60 psi and cycled off it would fool my tankless's flow sensor and have it throw a low flow error for a few seconds while pressure is dropping causing there to be no hot water. Scala2 is being shipped back today.
1)It seems like a basic pump with a CSV would equalize the pressure and flow past tankless flow sensor to prevent tankless heater from shutting off when there is small demand. My only concern is that if my flow is less then 1 GPM then CSV would start filling the tank which means it will eventually get to target pressure and then shut off. The scala2 has a very small built in tank. I was wondering if the more reasonably sized tank with CSV would cause the pressure bleed off to be slower and stop the tricking of tankless flow sensor on low demand
2)How do I size a pump for this? Any recommended pump? As said above I have about 20-22 psi. It is a shore house with 2 outdoor showers, 4 indoor showers/bathrooms, 2 kitchens and 2 washers. In short term, would this pump be okay to play/test? Lowes has a much better return policy then my plumbing supply and I could likely find another use for this lowes pump if the CRV and tankless dont play nice. Or if they do play nice together i can reuse this pump and then buy a more quality pump. https://www.lowes.com/pd/Utilitech-1-HP-Stainless-Steel-Lawn-Pump/1000678113
1)It seems like a basic pump with a CSV would equalize the pressure and flow past tankless flow sensor to prevent tankless heater from shutting off when there is small demand. My only concern is that if my flow is less then 1 GPM then CSV would start filling the tank which means it will eventually get to target pressure and then shut off. The scala2 has a very small built in tank. I was wondering if the more reasonably sized tank with CSV would cause the pressure bleed off to be slower and stop the tricking of tankless flow sensor on low demand
2)How do I size a pump for this? Any recommended pump? As said above I have about 20-22 psi. It is a shore house with 2 outdoor showers, 4 indoor showers/bathrooms, 2 kitchens and 2 washers. In short term, would this pump be okay to play/test? Lowes has a much better return policy then my plumbing supply and I could likely find another use for this lowes pump if the CRV and tankless dont play nice. Or if they do play nice together i can reuse this pump and then buy a more quality pump. https://www.lowes.com/pd/Utilitech-1-HP-Stainless-Steel-Lawn-Pump/1000678113