A. Pros and cons of gas versus electric water heaters

B. Brief overview of tank-type and tankless water heaters

C. Pros and cons of a traditional tank-type water heater

D. Pros and cons of a tankless water heater

E. Factors to consider when choosing between tank-type and tankless water heaters

F. Do tankless water heaters work well in cold climates?

G. What are the cost differences between tankless and tank type water heaters?

H. How to size a tankless water heater

I. How to size a traditional tank-type water heater

J. Additional resources for further reading

K. Summary of key takeaways

L. References and additional resources for further reading.