heated floor mats

That is something I didn't know existed. I have a hot water heated slab in the new addition to my shop but the old part where I do about half my work doesn't have floor heat and this looks like the cat's meow. Thanks for posting the link. Steve Peterson kettleriverironworks.com

The motorcycle guys have threads on the Web about making your own electric vests .. no big deal, just sew some skinny wire into the fabric, run some current. For a seed warming mat it should be a piece of cake because the connections don't need to be very robust. - GWE

I use an old waterbed heater burried in about 100 lbs of sand to distribute the heat

When I had snakes I would cast waterbed heaters in plaster or cement for basking stones. I had BIG snakes

I've been meaning to look at the heat wire that is used to keep plumbing from freezing. I think any hardware store would have it.

It does, however, need to be very waterproof.

The OP could always try an old heating pad in a plastic bag.

--RC (who lives where seed warming is the least of his problems.)

"Sometimes history doesn't repeat itself. It just yells 'can't you remember anything I've told you?' and lets fly with a club. -- John W. Cambell Jr.

thanks. i ended up shopping around and found a adequately sized and favorably priced heat pad. i called the manufacturer/importer and asked a series of questions (how hot are the three settings and how long it is ok to leave it on) and then asked if they thought it would be ok to use as a seed warming mat and i was astonished they said yes. (i assumed they would be afraid to expose themselves to a potential law suit if i burned my house down using their pad in a non-usual way.) (my intent is to leave it on almost/probably continuously for like a month or two.) (the heat pad is a dual "dry/moist heat" pad and is designed to be used in close proximity to moisture.)

(but to remain on metalworking topic, i posted the link for machinists with cold feet.)

b.w.

No connection, but I am familiar with this product.

A waterbed heater would also be a possibility.

Vaughn ( Yes, I still sleep on one)