Advice for replacing water tank and boiler

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icu222much

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Aug 28, 2021
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Location
Vancouver
I am looking to replace my rusting gas hot water tank (15 years old) and leaking gas boiler (30 years old), and am trying to determine what the most cost-efficient long-term solution (30+ years) would be (ie - installation fee, maintenance cost, gas bill...).

A bit about my house:
  • 3300 sqft 30 year old detached (5 bed, 5 bath)
  • Vancouver, Canada
  • ~$13/GJ gas price ($300 per winter month, $60 per summer month)
  • 5 zone radiant heat on both floors
  • Poly-b pipes

Questions:
  1. From my research, there are three systems I can use. Are there any other systems/options I have missed?
    1. Standard efficiency hot water tank & standard efficiency boiler
    2. High efficiency hot water tank (aka hot water on demand) & high efficiency boiler
    3. Combi system high efficiency with a storage tank (I was told I would need a water storage tank with a home larger then 3000sqft)
  2. Is one type of system (standard efficiency, high efficiency, combi system) more reliable then another? I figured the high efficiency and combi systems are more complex, therefore can break more easily.
  3. Would the maintenance for each system be similar? What should be done to maintain the system, the frequency, and the cost?
  4. Generally, how long does each type of system last?
  5. What do you think the gas savings would be with each type of system? From what I understand, a standard efficiency system is roughly 80% efficient, where-as a high efficiency would be around 95%. In that case, would I be saving just 15% on my gas bill if I purchase a high efficiency system?
  6. I have a few installers coming next week. Are there any specific questions I should ask them?
 

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