Radiant heat with tankless h2o heater

WyomikeMarch 12, 2013

I have an radiant heat set-up with staple up between joists and in slab for garage. Overall there is about 1000 feet of 1/2 inch tubing throughout including garage. Using recirc with tankless. Option on tankless is set-up for monitoring of temp every 1/2 hour by tankless unit and automatic firing of boiler if temp is greater than 9 degrees below set temp. I have set temp at 135, but temp only gets up to 111 degrees after running about 12 hours plus. I have two 1/25 hp pumps on system, one pushing water on suply side and other pulling on return. Both pumps are hot at 12 hrs+. Do I need bigger pumps? Do I need to up the set temp? Any input would be appreciated

Sign Up to comment
More Discussions
Fed up and ready to tackle my well water issues
I've been reading posts trying to educate myself for...
Marble shower panels valve replacement :( !!!
We have a couple of bathrooms with a single handle...
Vamsi Kodavanty
Fleck 5600 Econominder - Salty Tasting Water
I just installed a new 1.5 cu ft water softener with...
Details of a new residential water service
I'm in the planning stages of replacement for my 55...
Water Softener - calling justalurker
Hopefully you are still around. I had reached out a...
Sponsored Products
Beige p808be Single Bowl AstraGranite Sink
Spool Pendant Light in White
$169.00 | LexMod
Linen Gingham Curtain Panel - Set of Two
$29.99 | zulily
Meridian Black Window Curtain Panel
$31.95 | Bellacor
Cotton Candy Maker
Nourison Indoor/Outdoor Area Rug: Nourison Rugs Escape Grey 5 ft. 3 in. x 7 ft.
Home Depot
Manheim Decorative Copper Firewood Holder on Feet - Antique Copper
Signature Hardware
Nostalgia Electrics 2.5-qt Triple Slow Cooker Buffet
© 2015 Houzz Inc. Houzz® The new way to design your home™