An oil home usually has four or five real replacement options: a new oil boiler, a gas or propane conversion where available, an air-to-water heat pump on the existing radiators, air-source heat pumps that replace the hydronic system, or a hybrid. The best choice depends on the home's Manual J heating load, its emitters, fuel availability and rebates. Showing the homeowner every option, including the ones you ruled out and why, makes the recommendation easier to trust.
Oil customers are often motivated: fuel deliveries, tank age and price swings are already on their mind. That makes it a good moment to slow down, calculate the load and lay out every option on one page with an estimated 15-year cost for each.
This guide is in outline form. The full version will include an example comparison with assumptions shown.
In this guide
The options
- Like-for-like oil boiler replacement.
- Conversion to natural gas or propane.
- Air-to-water heat pump on the existing hydronic system.
- Ductless or ducted air-source heat pumps.
- Hybrid: heat pump plus the existing boiler on integrated controls.
Sizing every option on the same load
- One Manual J, not the old nameplate.
- Boiler sizing vs heat pump capacity at design temperature. See cold climate heat pump sizing.
Hot water and the tankless coil
- Why removing the boiler changes the hot water plan.
- Heat pump water heaters and indirect tanks.
Rebates and program rules
- NYS Clean Heat: full-load requirement, decommissioning category and the rule against new fossil equipment with an incentivized heat pump.
- Mass Save: whole-home vs partial-home rebates, integrated controls and income-based enhanced incentives for oil, propane and electric resistance homes.
- Details in our NYS Clean Heat and Mass Save guides.
Presenting the options
- 15-year cost of ownership with install price, rebates, energy and maintenance.
- Good/Better/Best built from the same design.
- Tips in how to sell HVAC.
Oil tank removal and decommissioning
- What decommissioning documentation programs ask for.
Price the options
Estimate output with the boiler sizing calculator and heat pump size with the heat pump sizing calculator. Both give estimates only.
Tradewright compares oil, gas, heat pump and hybrid options on 15-year cost using your own price book, and generates rebate documentation from the same design. See system comparison and heat pump vs boiler.
Questions
What can replace an oil boiler?
The common options are a new oil boiler, a conversion to natural gas or propane where available, an air-to-water heat pump on the existing radiators, air-source heat pumps that replace the hydronic system, or a hybrid that keeps fossil heat for the coldest hours.
Do rebates favor heat pumps over a new oil boiler?
In New York and Massachusetts, the large residential rebates are for heat pumps. Mass Save's whole-home and partial-home air-source heat pump rebates are for customers displacing existing oil, propane, electric resistance or natural gas heat, depending on their Mass Save sponsor, and NYS Clean Heat prohibits installing new fossil fuel equipment together with an incentivized heat pump.
Can I keep the oil boiler as backup with a heat pump?
Some programs allow it with conditions. Mass Save's partial-home rebate requires an integrated control from its qualified list where oil remains in use. NYS Clean Heat allows pairing with existing fossil systems using integrated controls in some categories and has a separate category for projects that decommission the old system.
How should I size the replacement?
Size it to a Manual J heating load, not the oil boiler's nameplate. Oil boilers in older homes are often oversized, and a heat pump selected on the old boiler's output will usually be oversized too.
What about hot water?
Many oil boilers also make domestic hot water through a tankless coil or indirect tank. Every replacement option needs a hot water plan, such as a heat pump water heater.
Sources
- NYS Clean Heat Heat Pump Program Manual, Version 3 (September 1, 2026), Section 2.1.2 Incentive Categories (accessed 2026-10-16)
- Mass Save: Air Source Heat Pump rebates and eligibility (accessed 2026-10-16)
- NEEP: Guide to Sizing and Selecting Air-Source Heat Pumps in Cold Climates (accessed 2026-10-16)