Why it matters
The Comfort System keeps hot water near the farthest tap so it arrives quickly. The pump mounts at the water heater with a timer, and a sensor valve under the farthest sink lets cooled water return through the cold line.
Grundfos rates it at 0 to 9 GPM and 0 to 6 ft of head, in bronze and stainless steel with 3/4 in connections and a 6 ft cord.
Who it's for, and who should skip it
Good fit if
- Long waits for hot water
- Homes without a return line
- Water-saving households
Look elsewhere if
- Homes with a dedicated return line (use a circulator)
- Tankless heaters without recirculation support
Pros and cons
Pros
- Timer included
- Bronze and stainless
- Well-known system
Cons
- Cold tap can run warm
- Pricier than generic pumps
- Sensor valve install
Limitations to weigh
- Under-sink recirculation without a return line sends warm water back through the cold line, so the cold tap at that sink can run warm for a few seconds.
- Hot water and electricity together: use a grounded outlet and follow the maker's installation steps.
Specifications
Every figure below comes from the source shown in brackets. Where the maker doesn't state something, we say so instead of estimating.
| Product weight | 6.06 lb | Retailer |
|---|---|---|
| Dimensions (seller) | 3.31 x 4.69 x 5.19 inches | Retailer |
| Model number | GRU-595916 | Retailer |
| Material | Bronze, Stainless Steel | Retailer |
| Voltage | 115 V | Retailer |
| Max flow (maker) | 9 GPM | Retailer |
| Warranty | 2 years from the date of installation | Retailer |
Alternatives worth comparing
More booster & recirculation pumps we cover
- KolerFlo H15GR-15 Booster Pump
- DC HOUSE DPHC-F42 Brushless Booster Pump
- Etespie 70 psi Whole-House Booster
- Simer 4075SS 3/4 HP Pressure Booster
All booster & recirculation pumps, compared in one table · Every Grundfos product we cover
Final verdict
The standard way to get hot water faster without new pipes.
Where to buy
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