Hi Anthony, YES, there are affiliate programs for plumbing and heating. Faucet.com and HomeDepot both have affiliate programs that you can join and earn a commission. Now, obviously, if customers need very specific parts only, this may be an issue. But, I know marketers that make a nice income using sites like the ones I mentioned and others. I would front it with your own website and build a following. These are things discussed within the Wealthy Affiliate program, how to build a website and earn money in something you’re passionate about. Check out Wealthy Affiliate. It’s free to join… Read more »
A blog highlights your technical ability and showcases your ability to write blog posts. Your blog can be about different topics than those you write about for your clients. In fact, it should be on a topic that interests you. Visitors will see that you can not only write, but you can also build an online community. A good blog has the potential to earn you many referrals for more clients.[24]
Sponsored posts work much in the same way as paid guest posts, but they are posted by big businesses instead of individual bloggers. Therefore, the scope for fees is much higher, as businesses have larger marketing budgets than humble bloggers. Having sponsored posts by large companies will also help promote your site as reputable and as a leader in its field.
The products and services you will be promoting to your audience must be relevant and good quality. Make sure you believe in them and know everything about them, because this will be crucial to you delivering the sales pitch to your audience. You need to build trust with your audience so make sure the products and services you choose to promote are trustworthy enough. 
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