Thermostatic mixing valve recommendation - 180 degrees

[jr_spyder]

Interesting first response. No, never have done this before but have been planning and researching for over two years. This has included getting professional advice from an HVAC engineering firm, published solar heating expert, and plumber. Now I'm getting down to the finer details and the mechanical work will start very soon. The new garage/barn with the heat storage mass under the slab is fully built.

Why do you ask?

[J.P.M.]

Hi,

Long time lurker first time poster. Happy to be here - you guys are smart. I hope I can return the favor later.

I'm designing a rather complex hydronic solar system that will heat a sand bed for heat storage and radiant heat in my garage, a DHW heater, hot tub, pool, a shunt loop, and more. It looks like I'll have six panels on my roof and the hot water will come in in 1-1/4" copper but eventually end up in some pex. At the first manifold I want the water to never exceed 180 degrees. In the sand bed manifold (8 pex loops) I never want more than 140 degrees. So the supply line from the roof needs a thermostatic mixing valve that will handle the max temp the panels will ever generate, and mix it down to 180 degrees max using return water for the cooling. I'm having a hard time finding the 1-1/4" mixing valve for this job. Can anyone recommend a specific valve, and/or an online source for all such items.

Thanks,

JR

Have you done this type of work in the past ?

[jr_spyder]

Hi,

Long time lurker first time poster. Happy to be here - you guys are smart. I hope I can return the favor later.

I'm designing a rather complex hydronic solar system that will heat a sand bed for heat storage and radiant heat in my garage, a DHW heater, hot tub, pool, a shunt loop, and more. It looks like I'll have six panels on my roof and the hot water will come in in 1-1/4" copper but eventually end up in some pex. At the first manifold I want the water to never exceed 180 degrees. In the sand bed manifold (8 pex loops) I never want more than 140 degrees. So the supply line from the roof needs a thermostatic mixing valve that will handle the max temp the panels will ever generate, and mix it down to 180 degrees max using return water for the cooling. I'm having a hard time finding the 1-1/4" mixing valve for this job. Can anyone recommend a specific valve, and/or an online source for all such items.

Thanks,

JR