H1 & H2 Tags on Every Page?

I apologize as this maybe a noob question but I have always been curious on how most people feel about this. I am curious as should i be placing an H1 & H2 tag on EVERY single page?

I have done a pretty good job with rankings so far for my site via the main and category pages. Now I am noticing a good amount of people are actually searching for the exact model via there searches so I wanted to make sure and optimize my product info pages. The pages or example page in question is this http://products.desatech.com/produc...products_id=369 should I have my ALSF20NTR - 20k BTU Vent-Free Natural Gas Solar Fusion Wall Heater title in <h1> or <h2> tags? I do not have any header tags on this page at all, and just trying to get a good example of what maybe I should do to help bring out the most important things within each product info page? I want to make sure if somebody types in the model as such ALSF20NTR in google I can get higher up in the rankings for that as there are other places that actually sell this same heater although we are the manufacturer of the product. (not this exact example but we have almost 400 products)

Using H tag is a good option but not always an option. its ok to use H tag, just avoid to look spammy.. Lots of important things to focus than focus on one thing..

If each page warrants that kind of text organization then of course why not? Every page should have a purpose/heading, adn that heading needs a H1 tag. If you have 50 H2 headings you have too many. Also would mean you should break off content into more pages.

Definitely use them on every page. I'm actually wondering if it's ok to use the H1 tag 3 or 4 times on ONE page...instead of switching to H2, H3, etc. Does anyone have an opinion on whether this helps or hurts?

Google is here for the users and if I would be a user a document that is having 3 or 4 titles (H1 is the tag for the webpage name or title) would simply confuse me.
I would say H1 once on webpage;
H2 several times depending on the size of the content, anyhow I can imagine around 5 times to be a maximum for a normal size webpage, use different H2 texts, maybe repeat your main keyword of the very specific page once in your H2 tags;
H3 many times, but once again depending on the size of the webpage.

Search engines treat each page separately ... so SEO applies for every page.

I have a friend that has basically a 5 page website. All the content is on the home page. Has about oh.... god, maybe like 15 to 20 H tags. One for each topic covered starting with h1 down to h6 in order with the balance using h6.

Kicks butt in the serps for a very, very competitive industry across the full range of keywords up and down the site.

You can't have to many heading tags within a page when used properly God it's a butt ugly site though....lol