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Home Water Heater Replacement Planner: Tank vs Tankless vs Heat Pump Fit, First Hour Rating Sizing, Permit and Code Items, Quote Comparison Sheet, and Rebate Check
Plan a home water heater replacement: compare tank, tankless, and heat pump units for your space and fuel, size by first hour rating or flow rate, list permit and code items such as expansion tanks and venting, compare installer quotes line by line, and check rebates to confirm before buying.
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Prompt
Act as a residential plumbing estimator who helps homeowners replace a failing water heater, compares tank, tankless, and heat pump options for the space and fuel available, and builds a quote comparison sheet before anyone signs a contract. Inputs: - Current heater label details: fuel (gas, electric, propane), tank size, age, venting type, and location in the house: [CurrentHeater] - Household hot water use: people, bathrooms, peak times, big tubs or simultaneous showers: [HotWaterUse] - Space and utilities at the install location: room size, nearby 240V circuit, gas line size, drain, and condensate options: [InstallSpace] - City or county and utility provider for permit and rebate checks: [LocationAndUtility] - Installer quotes with line items as pasted: [QuoteText] - Budget and timeline (emergency today vs planned replacement): [BudgetAndTimeline] - Output format: [Format] Generate: 1. A fit table for tank, tankless, and heat pump water heaters given CurrentHeater and InstallSpace: what has to change (venting, electrical, gas line, condensate) for each. 2. Sizing from HotWaterUse: first hour rating target for tank and heat pump units, and a flow rate and temperature rise estimate for tankless, showing the math. 3. A permit and code items list for LocationAndUtility to confirm: permit, thermal expansion tank, temperature and pressure relief discharge, seismic strapping if required, drain pan, and venting, each marked [confirm with local building department]. 4. A quote comparison sheet from QuoteText: unit model and size, warranty, permit included, haul away, expansion tank, venting or electrical work, and missing items. 5. A rebate and incentive check list for LocationAndUtility, with the federal heat pump water heater tax credit noted as [confirm current IRS rules]. 6. A recommendation that fits BudgetAndTimeline, with a second best option. 7. Questions to ask each installer before signing. Constraints: - Do not invent rebate amounts, permit fees, or product prices. Mark them [confirm]. - Gas and electrical work should be done by licensed pros where required; say so. - Plain, practical tone. No em dashes.
Instructions
Replace every [bracket] with your details before running. Works on ChatGPT, Claude, and Gemini.
Generated Output
This image was generated using the prompt above.
Examples
Example Input
CurrentHeater: 50 gallon natural gas tank, atmospheric vent into a shared chimney with the furnace, 13 years old, leaking at the base, in an unfinished basement HotWaterUse: 4 people, 2.5 baths, two showers often run at the same time from 6:30 to 7:30 am InstallSpace: basement room about 12 by 15 feet, floor drain nearby, electric panel 6 feet away with 2 open slots, 1/2 inch gas line to the heater LocationAndUtility: Columbus, Ohio; gas from Columbia Gas, electric from AEP Ohio QuoteText: Quote A: 50 gal gas tank, 6 year warranty, $1,950, includes haul away and permit; Quote B: 199k BTU tankless, $4,800, includes new vent, says gas line upgrade extra; Quote C: 65 gal heat pump water heater, $3,900, includes new 240V circuit, no permit listed BudgetAndTimeline: leak means we need hot water within a week; budget around $3,500 but open to more if savings are real Format: fit table, sizing, permit items, quote sheet, rebate check, recommendation, installer questions
Example Output
1) FIT TABLE | Option | What changes | Notes | | Gas tank 50 gal | Little. Reuse vent if it passes inspection | Fastest swap | | Tankless gas | New direct vent, likely bigger gas line than 1/2 inch, condensate drain | Quote B flags gas line as extra | | Heat pump 65 gal | New 240V circuit, condensate to floor drain, room air volume | 12 x 15 basement is a good size; it will cool the room a little | 2) SIZING Peak hour: two showers at once for an hour. Tank and heat pump: target a first hour rating of about 80 gallons or more [confirm per unit label]. Tankless: two showers at about 2.0 gpm each = 4.0 gpm. Ohio winter inlet water near 45 F to a 120 F setpoint is a 75 F rise. Check that the unit delivers 4.0 gpm at a 75 F rise on its chart [confirm on spec sheet]. 3) PERMIT AND CODE ITEMS (confirm with Columbus building department) - Permit for replacement [confirm] - Thermal expansion tank if the home has a check valve or pressure reducing valve [confirm] - T and P relief valve discharge pipe to within a few inches of the floor or drain [confirm] - Drain pan [confirm if required in basement] - Venting: with the furnace sharing the chimney, a new tank must still vent correctly; ask for a draft test [confirm] - Gas line sizing for tankless [confirm with licensed plumber] - 240V circuit for heat pump by a licensed electrician 4) QUOTE COMPARISON | Item | A gas tank | B tankless | C heat pump | | Price | $1,950 | $4,800 plus gas line | $3,900 | | Size | 50 gal | 199k BTU | 65 gal | | Warranty | 6 yr | [missing] | [missing] | | Permit | Included | [missing] | Not listed | | Haul away | Included | [missing] | [missing] | | Expansion tank | [missing] | [missing] | [missing] | | Venting or electric | Reuse vent | New vent included | 240V included | Missing items to ask about: warranty on B and C, permit on C, expansion tank on all three. 5) REBATES TO CHECK - AEP Ohio heat pump water heater rebate [confirm amount and eligibility] - Columbia Gas efficiency offers for gas units [confirm] - Federal tax credit for heat pump water heaters [confirm current IRS rules] 6) RECOMMENDATION Best fit: Quote C heat pump at $3,900, slightly over budget, if the installer adds the permit and confirms delivery within the week. It meets the first hour target and any rebate may close the gap [confirm]. Second best: Quote A gas tank at $1,950, fastest and cheapest, if timing or rebates fall through. 7) INSTALLER QUESTIONS - Can you install within 7 days, and is a loaner or temporary option possible? - Is the permit included, and who schedules the inspection? - Is an expansion tank needed here, and is it in the price? - What is the parts and labor warranty? - For C: what first hour rating does this model have in hybrid mode?