Hydronic Duct Heater

spraggin

I have an A2W heatpump hydronic system and would like to find hydronic duct heaters for venthood makeup air and ERV pre-heat (in the 200-300CFM airflow range). I see these in Europe as part of of what they call MVHR systems a lot. some examples are https://www.ventilation-alnor.co.uk/index/products-en/air-curtains-and-duct-heaters/chdw.html and https://www.ventmatika.lt/index.php/cwh-cwc-circular-duct-heaters-and-coolers/?lang=en

If these just don't exist in North America, I guess I can build an equivalent, but most "off the shelf" hydronic coils seem to be for whole house, large BTU applications with one or two rows. Is there a brand that will sell low quantities of custom or has a squat 3 or 4 row stock coil?

pedmec

Coils can be custom made in all shapes and sizes. and what your looking for is sold in america only it might not in the size your looking for. the one i'm working on now is the size of an RV

EdTheHeaterMan

Looks like Granger has small coils. You may need to make a box for them.
https://www.grainger.com/category/hvac-and-refrigeration/heaters/hydronic-boilers-heaters/hydronic-duct-heating-cooling-coils

Mosherd1

https://a.co/d/587RAj0 How small are you looking for? Amazon goes down to 12” x 12”

mattmia2

It is more of a commercial product used as reheat of supplies to individual rooms in large buildings so that is where I would look.

hot_rod

Kickspace heaters have nice small coils.
Whalen, First Co, magic Aire all have or will make most any size coil you would need. But online is where I would, e bay, etc.