Pool Heater Bypass - Check Valve

[H2Obsessed]

Hello,
I will install a heater next season for my in ground pool and need to install a bypass. I read that the best solution is a 3-way valve with a bypass installed at the heater return like this:

I have read that many people had issues with the flow after installing a check valve or some people that just generally dislike check valves. All my plumbing is 1.5" and I want to make sure I get the best flow possible.
Would it be a better solution to replace the Jandy check valve with a simple ball valve that I could close when the filter is bypassed ?
Thank you !

 

[SJPoe]

I would imagine any restriction from a check-valve would be significantly less than the restriction from the heater core.

The only issue with having two valves is the risk of having them in an incompatible configuration - i.e. Not bypassing the heater, but the outflow being closed still etc.

 

[H2Obsessed]

I would imagine any restriction from a check-valve would be significantly less than the restriction from the heater core.

The only issue with having two valves is the risk of having them in an incompatible configuration - i.e. Not bypassing the heater, but the outflow being closed still etc.

Yes exactly ! I'm already adding restriction with the heater, I don't want to add more for no reason. I understand this would be the only problem but I really don't think I will forget to change both
I'm wondering if its a good tradeoff for better flow and how much does a check valve really affect the flow : /

 

[ajw22]

I really don't think I will forget to change both

Will you be the only one to ever touch the valves on your pool over the life of your equipment?

how much does a check valve really affect the flow

None for the flows modern equipment is run at.

So now tell us what equipment you have since your signature does not include any details about your pump, filter, or heater.

Let's move from musing and myths to facts and science.

 

[ajw22]

Adding 2 feet of head has an insignificant effect on flow.

The 90 degree check valve is 3 feet of head loss at 80 gpm, so not a big deal.

 

[ajw22]

 

[H2Obsessed]

Will you be the only one to ever touch the valves on your pool over the life of your equipment?



None for the flows modern equipment is run at.

So now tell us what equipment you have since your signature does not include any details about your pump, filter, or heater.

Let's move from musing and myths to facts and science.

Yes I will be the only one. Sorry about that I updated my signature.

Pump: Moov MP15AI (1.25HP)
Pool Heat Pump: Thermeau TH85
Filter Type: Sand

 

[H2Obsessed]

View attachment 615418

Thank you for the chart, I should have looked it up ! This barely adds anything.