Double-wall heat exchangers.
2″ – 4″ copper pipe with coiled copper tubing around outside.
Photos…
Manufacturers…
Payback…
Gas hot water
90% efficient
Doesn’t really payback now…but much less guilt taking long showers.
Double-wall heat exchangers.
2″ – 4″ copper pipe with coiled copper tubing around outside.
Photos…
Manufacturers…
Payback…
Gas hot water
90% efficient
Doesn’t really payback now…but much less guilt taking long showers.