Dometic 420 Platinum
#11 in RV gravity-flushFull review
The elongated porcelain top of the Dometic range for owners who want a full residential feel.
Amazon $419.99$419.99
The Dometic 420 Platinum rates 3.4 among RV gravity-flush boat or RV toilets; the Johnson Pump AquaT Silent Electric Comfort rates 3.1 among electric marine ones. The Dometic 420 Platinum costs $23.48 less ($419.99 vs $443.47).
Prices were last checked November 9, 2026. Product prices and availability are accurate as of that date and are subject to change; the price and availability shown on Amazon or the retailer's site at the time of purchase apply. As an Amazon Associate we earn from qualifying purchases.
Johnson Pump AquaT Silent Electric Comfort
The larger-bowl version of Johnson’s quiet electric head. Good for boats that want a comfortable bowl without the premium price.
Amazon $443.47$443.47
Scores side by side
These two sit in different type classes (RV gravity-flush and electric marine), and each is scored against the reference points for its own class, so a rating says how well each does among its own type peers. How we rank explains each factor.
| Factor weight | Dometic 420 Platinum | Johnson Pump AquaT Silent Electric Comfort |
|---|---|---|
| Overall rating | 3.4/5 | 3.1/5 |
| Value 25% | 0 $419.99, against other toilets in its group | 68 $443.47, against other toilets in its group |
| Flush water 20% | 50 flush volume not published (neutral score used) | 26 0.7 gal (2.5 L) per flush |
| Power draw 15% | 100 no electrical draw | 77 13 A at 12 V |
| Features 25% | 100 ceramic or porcelain bowl, soft-close seat, freshwater flush, water-saver flush, household-size bowl | 45 ceramic or porcelain bowl, household-size bowl |
| Warranty 15% | 25 2-year warranty | 0 warranty not published, scored as none |
Specifications
| Dometic 420 Platinum | Johnson Pump AquaT Silent Electric Comfort | |
|---|---|---|
| Flushing | ||
| Type | Gravity | Electric |
| Flush water | - | Raw or fresh |
| Water per flush | - | 0.7 gal |
| Freshwater flush | Yes | - |
| Water-saver flush | Yes | - |
| Macerator | No | - |
| Control | Foot pedal | Push button panel |
| Power | ||
| Voltage | - | 12 V |
| Draw at 12 V | None | 13 A |
| Bowl and fit | ||
| Bowl size | Elongated, standard | Comfort |
| Bowl material | Porcelain | Porcelain |
| Household size | Yes | Yes |
| Soft-close seat | Yes | No |
| Seat height | 18 in | - |
| Rough-in | 7.6 in | - |
| Inlet hose | - | 3/4 in |
| Discharge hose | - | 1-1/2 in or 1 in |
| Build | ||
| Weight | - | 24.3 lb |
| Warranty | 2 years | - |