Pentair MasterTemp 300
For a typical in-ground pool on Pentair automation that wants faster heat than a 250 without the gas line a 400 needs.
Amazon $4,099.99$4,099.99
300,000 BTU/h84%1 year
2.2/5
A compact low NOx heater for an in-ground pool on Jandy automation, if the price premium over rivals is acceptable.
- 260,000 BTU/hHeating input
- 84%Efficiency
- Natural gas or propaneGas type
Check price at Amazon$4,493.12
Price checked November 9, 2026. As an Amazon Associate we earn from qualifying purchases.
Pros
- Light 120 lb cabinet fits a 2 by 2 ft pad and is easy to place
- Low NOx with 84% efficiency
- Plugs into Jandy AquaLink automation over RS-485
- Indoor or outdoor installation fits more equipment pads
Cons
- Costs more than Hayward and Raypak heaters of similar input
- Warranty terms for online purchases are not published
- Plain copper heat exchanger is less forgiving of salt and low pH than cupronickel
The Jandy JXi family
Every Jandy JXi model we rank, smallest first. Ratings compare each against its own size.
| Model | Heating input | Rating | Price |
|---|---|---|---|
| Jandy JXi 260 (this one) | 260,000 BTU/h | 2.2/5 | $4,493.12 |
| Jandy JXi 400 | 399,000 BTU/h | 3.5/5 | $5,300 |
How it scores
The rating comes from 4 measured or published factors, each scored 0-100 against fixed reference points for its size. How we rank explains each one.
Specifications
| Model number | JXI260N |
|---|---|
| Heating | |
| Gas input | 260,000 BTU/h |
| Gas type | Natural gas or propane |
| Thermal efficiency | 84% |
| Condensing | No |
| Low NOx | Yes |
| Heat exchanger | Copper |
| Max water flow | 100 GPM |
| Installation and controls | |
| Ignition | Electronic |
| Venting | Both |
| Digital controls | Yes |
| Automation or app | Yes |
| Weight | 120 lb |
Alternatives in this size
Pentair MasterTemp 250
A strong pick for in-ground pools already on Pentair automation, though online buyers get only a short warranty.
Amazon $3,098$3,098
250,000 BTU/h84%1 year
Hayward H-Series H250FD
A low NOx, salt tolerant in-ground pool heater for owners who buy online and can live with a short warranty.
Amazon $3,999$3,999
250,000 BTU/h84%1 year
Compare
Compare the Jandy JXi 260 with any other gas pool heater →
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