I'm in the market for a new hot water system for a large home (5000 sq ft).
- 6 bathrooms, 4 full
- spa jacuzzi
- 2 dishwashers
- 1 shower with two lines, 3 heads + 2 body wash
- dual laundry rooms
- total of 13 sinks in the house
Water heaters are quite close to the gas source and exterior wall (4-6' vents). Thinking we will upgrade to 2lb gas. Considered running a dedicated line to the tankless, but there are a lot of BTUs in this house - close to 1,000,000 if everything is going at the same time...
I'm going to be here a while and am looking for the best possible design.
I looked at stainless tank vs. tankless and decided on tankless. I need ~150gal. Current have 1x75gal and 1x50gal. Both power vented. Pretty small space - maybe 5x5.
I'd like one control system for both tankless heaters, so I want them to communicate. If they can load shed/alternate to maximize longevity that would be a great bonus.
Considering two options:
1. 2xNavien NPE240A + external re-circ.
2. 2xRinnai RUC98i's + HTP everlast stainless 10gal buffer tank (1500w electric so it will work with 120V 20A) + external re-circ. Cannot use two RURs or RUC+RUR if you want just one control system for both units - silly limitation.
It is a difficult decision. Option 2 is about $1k more expensive. The Navien has two SS burners and a built-in buffer tank. I'm leaning toward option 2 - the Rinnai design - because:
a.) they appear to have the best reliability
b.) they have the longest track record
c.) they are the most commonly used design and as a result could be easier to have serviced
d.) best venting (UBBink concentric)
e.) I like the remote 195T control.
Location is the Pacific NW - water hardness = 1 - it is very good water.
Thoughts?? Thanks, -mark
- 6 bathrooms, 4 full
- spa jacuzzi
- 2 dishwashers
- 1 shower with two lines, 3 heads + 2 body wash
- dual laundry rooms
- total of 13 sinks in the house
Water heaters are quite close to the gas source and exterior wall (4-6' vents). Thinking we will upgrade to 2lb gas. Considered running a dedicated line to the tankless, but there are a lot of BTUs in this house - close to 1,000,000 if everything is going at the same time...
I'm going to be here a while and am looking for the best possible design.
I looked at stainless tank vs. tankless and decided on tankless. I need ~150gal. Current have 1x75gal and 1x50gal. Both power vented. Pretty small space - maybe 5x5.
I'd like one control system for both tankless heaters, so I want them to communicate. If they can load shed/alternate to maximize longevity that would be a great bonus.
Considering two options:
1. 2xNavien NPE240A + external re-circ.
2. 2xRinnai RUC98i's + HTP everlast stainless 10gal buffer tank (1500w electric so it will work with 120V 20A) + external re-circ. Cannot use two RURs or RUC+RUR if you want just one control system for both units - silly limitation.
It is a difficult decision. Option 2 is about $1k more expensive. The Navien has two SS burners and a built-in buffer tank. I'm leaning toward option 2 - the Rinnai design - because:
a.) they appear to have the best reliability
b.) they have the longest track record
c.) they are the most commonly used design and as a result could be easier to have serviced
d.) best venting (UBBink concentric)
e.) I like the remote 195T control.
Location is the Pacific NW - water hardness = 1 - it is very good water.
Thoughts?? Thanks, -mark