Hayward H-Series Heater Natural Gas Valve 150-400 MV | HAXGSV0001
Hayward Products
SKU: HAXGSV0001
Hayward HAXGSV0001 Millivolt Natural Gas Valve (MV) — H-Series 150–400 (ED1 Style)
The Hayward HAXGSV0001 is a genuine OEM millivolt (MV) natural gas valve used on select Hayward H-Series pool heaters. This valve regulates the flow of natural gas to the burner system. It is the correct style for millivolt heaters (powered by a thermopile/thermal generator), not electronic dual-stage systems.
Fits / Compatibility
- Hayward H-Series Millivolt (MV) heaters in the 150,000–400,000 BTU range
- Commonly listed for ED1-style heater models, including: H150ED1, H200ED1, H250ED1, H300ED1, H350ED1, H400ED1
Fit tip: Confirm your heater is a millivolt (MV) model and uses natural gas (not propane). Gas valves are not interchangeable between fuel types or between MV vs electronic/dual-stage heater configurations.
What It Does
- Controls and regulates natural gas flow to the burner system
- Works with the heater’s millivolt safety circuit (thermopile-powered systems)
- Helps maintain stable heater operation when the correct gas supply and manifold settings are present
Common Reasons to Replace
- Heater will not light or will not stay running after troubleshooting confirms proper water flow and ignition components
- Intermittent shutdowns linked to a failing valve (after verifying thermopile output and wiring integrity)
- Gas valve is leaking, sticking, or has damaged terminals/valve body
- Valve failure discovered during heater service or refurbishment
What’s Included
- 1 OEM HAXGSV0001 millivolt natural gas valve
Important Installation Notes
- Gas components should be serviced by a qualified technician.
- After installation, the system must be leak tested and verified for correct operation.
- Confirm proper gas supply type (Natural Gas), inlet pressure, and heater model compatibility before ordering.
- If a new valve doesn’t resolve ignition issues, verify the thermopile output, safety switches, wiring, and gas supply before further parts replacement.
Related Products
- Hayward HAXGSV0001 Gas Valve (search)
- Hayward H-Series Thermopiles / Generators (search)
- Hayward H-Series Pilot & Ignition Parts (search)
- Hayward HAXPSA1930 Pressure Switch Assembly (search)
- Hayward H-Series Heater Parts (search)
Maintenance Tips
- Keep the heater area clear for proper airflow and safe operation.
- Maintain proper water flow (clean filter and baskets) to avoid nuisance shutdowns that can look like a gas/ignition problem.
- If ignition becomes inconsistent, verify gas supply, thermopile output, and safety switch operation before replacing major components.
- Maintain balanced water chemistry to reduce scaling inside the heater and extend overall heater life.
Questions about returns? View our return policy.
Hours Of Operation:
Monday - Friday: 7:00 am to 5:00 pm Phoenix Time
Saturday: 8:00 am to 2:00 pm
Sunday: Closed
- We do not ship on Saturday or Sunday.
- Orders totaling more than $300 will require signature confirmation upon delivery.
- We process and prepare orders for shipment within 1 business day. Please note that many other pool supply retailers require 3–5 days of handling time before shipping.
- Orders placed after 1:00 pm Phoenix Time may not be eligible for same-day shipment.
- Expedited shipping options are available at checkout.
Return Policy:
- Products that are received damaged will receive a refund in store credit.
- Most products are eligible for return within 30 days of receipt, except where noted below.
- To initiate a return, please complete an RMA form prior to sending your item back.
- Original shipping costs are non-refundable and will be deducted from the return credit.
- Items returned missing accessories or original packaging, or that are not in the same condition as received, may be subject to a restocking fee of up to 100% depending on the condition of the item upon return.
- Some returns will be charged an automatic 15% restocking fee.
- We are unable to issue refunds for items that have been damaged or rendered inoperable due to installer error.
- Please complete the return form to receive your RMA number and return shipping label.
- Chemical products are not eligible for return under any circumstances.
- The Pentair Colorsync 618031 is not eligible for return.
- Pool cleaners are not eligible for return.
- Opened seals and o-rings are not eligible for return.
- Capacitors are not eligible for return.
- Plastic popup tools are not eligible for return.
- Automation components and circuit boards are not eligible for return.
- If a light is returned due to a reported malfunction and is found to be fully operational upon testing, return shipping costs and a restocking fee will be deducted from the refund.
- Orders refused at the time of delivery will be subject to the original shipping costs being deducted from the refund.
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