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 »
For me I would choose a program with Recurring commission. You can build a real passive income. Its the best way to go! One suggestion is contact companies who sell services and ask if you can sell their service for them. Sometimes popular affiliate programs like these have just way too many people trying to sell their service. I personally went to sitecare.ca and asked them if I could sell their service and I couldn’t be happier! So find a service you believe in and go for it!
There’s a good reason why ClickBank is still a strong contender, however it does tend to focus more on digital products which may be of questionable quality. Yes, the review process is more professional these days, but it’s still primarily focused on selling digital products, especially “how to make money” courses and the like. That being said, there are some genuinely high-quality products on offer, and few affiliate programs are bigger than ClickBank, especially in selling (primarily digital) books.
Building trust with your audience is paramount in affiliate marketing, and the quickest way to lose trust is to recommend products either you haven’t used before or that aren’t a good fit for your audience. Also make sure you never tell anyone to directly buy a product, you are simply recommending the product. The more helpful you are and the more you make quality recommendations, the more likely your web visitors will come back for your expertise. 
For those new to this powerful online merchandising concept, affiliate programs work as intermediaries between the affiliate marketers who will sell products and services and the merchant who provides those products and services as well as the affiliates programs.  Merchants work with affiliates to help get their products or services to their consumers.
Websites consisting mostly of affiliate links have previously held a negative reputation for underdelivering quality content. In 2005 there were active changes made by Google, where certain websites were labeled as "thin affiliates".[34] Such websites were either removed from Google's index or were relocated within the results page (i.e., moved from the top-most results to a lower position). To avoid this categorization, affiliate marketer webmasters must create quality content on their websites that distinguishes their work from the work of spammers or banner farms, which only contain links leading to merchant sites.
MaxBounty works exclusively with digital products, usually about giving one’s email or signing up for a newsletter. MaxBounty has CPA, Pay-per-call, and CPL campaigns that you can choose from. MaxBounty is involved in a large number of verticals, including market research, real estate, social games, finance, dating, and diet, but is primarily designed for marketers seeking to acquire new leads.
Designed to create a huge amount of traffic at all times, these sites focus on building an audience of millions. These websites promote products to their massive audience through the use of banners and contextual affiliate links. This method offers superior exposure and improves conversion rates, resulting in a top-notch revenue for both the seller and the affiliate.
In 2006, the most active sectors for affiliate marketing were the adult gambling, retail industries and file-sharing services.[21]:149–150 The three sectors expected to experience the greatest growth are the mobile phone, finance, and travel sectors.[21] Soon after these sectors came the entertainment (particularly gaming) and Internet-related services (particularly broadband) sectors. Also several of the affiliate solution providers expect to see increased interest from business-to-business marketers and advertisers in using affiliate marketing as part of their mix.[21]:149–150
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