Inclusion Criteria:
* BMI 30-50 kg/m2
* Stable weight within the 3-months prior to enrollment (\< 5 % weight loss or gain)
* Documented heart failure, defined by satisfying at least one of the below criteria, with left ventricular ejection fraction ≥ 45% at time of screening
* Elevated left ventricular filling pressures
* Elevate natriuretic peptide levels
* Echocardiographic abnormalities consistent with HFpEF
* Hospitalization for heart failure in prior 12 months plus ongoing treatment with diuretics
* NYHA Functional Class II-IV
* KCCQ-CSS score \< 90
* 6-minute walk test \> 100 m
* No hospitalizations due to HF between screening and baseline visit
* Satisfies the indications for use and intended population as described in the IFU for Overstitch Endoscopic Suturing System
* Is not currently taking any over the counter or prescribed weight loss supplements or any anti-obesity medications
* Agrees not to take additional over the counter or prescribed weight loss supplements / medications during study participation
* Medications for management of diabetes that are stable for the last 6 months, no changes to type or dose and no expected changes during study participation
* Agrees to the follow-up requirements of the study and provides informed consent
Exclusion Criteria:
* Patients not willing to have an ESG procedure for the treatment of weight loss
* History of prior bariatric surgery or procedure
* Pre-existing esophageal stenosis/stricture preventing advancement of an endoscope during screening/baseline Esophagogastroduodenoscopy (EGD)
* Esophageal, gastric or duodenal malignancy
* Uncontrolled coagulopathy or inability to be off anticoagulation or anti-platelet medication (ASA, Plavix) for 1 week prior to and 2 weeks after each endoscopy
* Known portal hypertension, visible esophageal or gastric varices, or history of esophageal varices
* Prior surgical or endoscopic anti-reflux procedure
* Current or planned management of Type 2 Diabetes with incretin medications
* Inability or unwillingness to comply with protocol requirements related to visits
* Investigator's medical judgement that the subject is not a candidate for the ESG procedure
* MI, stroke, hospitalization for HF, unstable angina pectoris, or TIA within 30 days prior to the day of screening
* SBP \>160 mm Hg at screening
* Planned coronary, carotid or peripheral artery revascularization
* Any other condition judged by the investigator to be the primary cause of dyspnea
* End-stage renal disease or chronic or intermittent hemodialysis or peritoneal dialysis
* Presence or history of malignant neoplasm within 5 years prior to the day of screening Basal and squamous cell cancer and any carcinoma in-situ are allowed
* Female who is pregnant, breast-feeding or intends to become pregnant or is of child-bearing potential and not using a highly effective contraceptive method
* Participation in any clinical trial of an approved or non-approved device for the treatment of HF or obesity within 30 days before screening
* Major surgery scheduled for the duration of the trial, affecting walking ability in the opinion of the investigator
* Any disorder, including severe psychiatric disorder, suicidal behavior within 90 days before screening, and suspected drug abuse, which in the investigator´s opinion might jeopardize subject´s safety or compliance with the protocol