Denver-based Enservco Corp., a provider of well-site services, said it will invest $6 million in capital expenditures during 2013, with $4.7 million being allocated to new equipment fabrication. The budget also includes $1.3 million for enhancements to existing equipment. Management estimates the annualized revenue potential from the new equipment at about $10 million. The equipment includes nine frack heating trucks with a total of 12 burner boxes, four hot oilers and two well acidizing trucks. The investments will expand the company’s frack heating capacity by 40% and increase its hot oiling fleet by 15%. Enservco said sales during April reached $3.7 million, up 85% from one year ago. The improvement was fueled in part by cool spring temperatures across the company’s service territories, as well as sustained demand for fluid heating services, particularly in regions where new fracking techniques require higher water temperatures than traditional frack designs.